JanuarylFebruary 2005 PotteryMaking Illustrated 1
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4 TABLE OF CONTENTS Features 14Making a Covered Casserole by Leon Roloff Great throwing ideas, one beautiful casserole 20 Creating Indian Bottles by Gaylon Dingier A combination of building techniques that can be to many forms 29 Exploring the Use of Commercial Glazes by Lisa Bare Culp Three ways to add depth to your glazes 32Wood Ash: Preparing for Glazes by Kathy Chamberlin Clean wood ash enhances your glaze palette 36 Designing with Wax Resist by Marj Peeler Achieve intricate glaze designs "Indian Bottle," 18 inches (46 centimeters) in height, stoneware, by Gaylon Dingier. 2 PotteryMaking Illustrated January/February 2005
5 Departments 4 Fired Up Try Something New! by Tim Frederich 6 Ask PMI Bisque Firing Temperature 8 Getting Started Building with Coils by Snail Scott 10 Spare Parts Sanders by Mel Jacobson 12 Beyond Basics Sieving Ceramic Materials by ohn Toki 38 Kids Korner Canopic Jar by Jennifer Wankoff 40 Off the Shelf Basic Pottery Books by Sumi von Dassow 42 In the Mix Simple Cone 6 Glazes 48 The Peephole On the Cover: Leon Roloff takes a break from throwing a casserole dish. Photo Credit: Thomas Michael Alleman Vase, 11 inches (28 centimeters) in height, stoneware with wax-resist decoration, by Marj Peeler.
6 Firedllp Try Something New! T here never seems to be enough hours in each day. I have folders and notebooks filled with sketches and ideas gathered over the years from workshops, books, magazines, or gleaned from teaching. There is simply not enough time to try them all. When I was involved full time in pottery production, I kept thinking to myself, Pll try it tomorrow. Many weeks, even months would pass before I might find time to run a test or try a new technique that might improve my pottery making ability. Have you found yourself in this same quandary? Tim Frederich working My goal for the New Year is to try at least in his studio. one new idea or test each week. It can be a simple glaze test for the next firing or developing a new extruder die. We all have a limited amount of time, but need to try something new. Experimentation keeps the mind open to new ideas. It doesn t matter whether the experiment succeeds or fails; the knowledge gained is the most important factor. This knowledge adds to our ability. If you can throw a bowl and want to experiment further with this shape, try making a casserole, as in the cover story in this issue of Pottery Making Illustrated. If you like to handbuild, you may want to try the technique for making a mold using Styrofoam shown in the article on Indian bottles. You may find that glaze testing is a great place to start trying new ideas. Make up recipes, find them in books, magazines (see In the Mix) or on the web. In just minutes, you can make a test batch. I keep boxes of bisque test tiles on hand for this purpose. Lisa Bare Culp has been experimenting with commercially prepared glazes in combination with her own glazes (see Exploring the Use of Commercial Glazes in this issue). Try this technique to add a new dimension to your work. I keep books, magazines and a notebook nearby and when I have a spare moment, I read and make notes on ideas to try. As you read the articles in this issue of Pottery Making Illustrated, jot down some ideas and try something new this week. Let me know if you are pleased with your results. Please send all submissions, questions, comments or images of work you have created from a project in the magazine to me: Pottery Making Illustrated, 735 Ceramic Place, Westerville, Ohio 43081; or send an tfrederich@ceramics.org. Volume 8 Number 1 Editor Tim Frederich Assistant Editor Renee Fairchild Assistant Editor Jennifer Poellot Marketing Manager Susan Enderle Graphic Design I Prod. Dave Houghton Assistant Web Developer Dianna Williams Advertising Manager Steve Hecker Advertising Serv. Rep. Debbie Plummer Publisher Rich Guerrein Editorial Advisory Board David Gamble Steven Hill Anna Calluori Holcombe Mel Jacobson Bill Jones Jonathan Kaplan Dannon Rhudy John Toki Anderson Turner Editorial, Advertising and Circulation Offices P0 Box 6136 Westerville, OH Phone: FAX: customerserv@ceramics.org Pottery Making Illustrated (ISSN X) is published bimonthly by The American Ceramic Society, 735 Ceramic Place, Westerville, Ohio Periodical postage paid at Westerville, Ohio and additional mailing offices. Opinions expressed are those of the contributors and do not necessarily represent those of the editors or The American Ceramic Society. Subscription rates: 6 issues (1 year) $22, 12 issues (2 years) $41, 18 issues (3 years) $58. Add $18 per year for subscripptions outside North America. In Canada, add 7% GST (R ). All payments must be in US$ and drawn on a U.S. bank. Allow 6-8 weeks for delivery. Advertising: Ad rates and ad information are available on the website or by contacting Steve Hecker at the address above or by phone: Change of address: Send your change of address via , to the Circulation Department, or on our website. Allow six weeks advance notice. Contributors: Writing and photographic guidelines are available on request and on the website. Mail manuscripts and visual materials to the editorial offices. Photocopies: Permission to photocopy for personal or internal use beyond the limits of Sections 107 and 108 of the U.S. Copyright Law is granted by The American Ceramic Society, ISSN X, provided that the appropriate fee is paid directly to Copyright Clearance Center, Inc., 222 Rosewood Dr., Danvers, MA USA; ; Prior to photocopying items for educational classroom use, please contact Copyright Clearance Center, Inc. This consent does not extend to copying items for general distribution, for advertising or promotional purposes, or to republishing items in whole or in part in any work and in any format. Please direct republication or special copying permission requests to the Publisher, The American Ceramic Society, P0 Box 6136, Westerville, Ohio Back Issue: When available, back issues are $5 each, plus $4 shipping and handling for the first issue and $1 for each additional copy thereafter. For outside orders outside North America, add $6 ($2 for additional copies). In Canada, add 7% GST. Postmaster: Send address changes to Pottery Making Illustrated, P0 Box 6136, Westerville, Ohio Form 3579 requested. Tim Frederich, Editor Copyright 2004 The American Ceramic Society Allrights reserved 4 PotteryMaking Illustrated JanuarylFebruary 2005
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8 Ask PMI Bisque Firing Temperature Key to Success EXPERT ANSWERS Many potters talk about firing to different bisque temperatures. What temperature/cone number should I be firing to and at what heating rate? D.G. One of the most misunderstood..and varied steps in making pottery is bisque firing. You aren t the first to ask, To what cone should I bisque fire? Ron Roy, a Canadian potter and glaze expert, has been very vocal in his opinion that the longer one bisque fires, the better. It is essential to fire long and slow to allow the release of natural organic materials and gases from the clay body. Fast bisque firing closes the pores in the clay body and traps foreign material. That stuff will come out of the clay during the glaze firing and cause many of the glaze faults that potters experience (pinholes, blisters, etc.). The ingredients in your clay body also will determine the bisque temperature. Clay bodies with more organic materials (such as sulfur and carbon) not only need a longer firing, but may need to reach a higher temperature to completely burn out the organic materials. The bisque-fire temperature or cone number depends on the type of work being fired and the production process. Soft bisque absorbs a great deal of water, and with it, glaze chemicals. Hard bisque doesn t absorb as much and a thicker glaze is needed to allow enough adhesion to the clay body. Potters doing low-temperature work often bisque fire in the Cone range to tighten and strengthen the body. Industry does the same thing high-temperature bisque and low-temperature glaze firing. This can save you money, since you can pack the kiln tighter during bisque firing, then do a faster glaze firing at a lower temperature. Bisque fire temperatures can range from Cone 012 to Cone 03. Soft bisque (Cone ) can be fragile and requires care in handling during the glazing process. For production work, consistency is vital. Fire your bisque the same way, to the same cone, every time. Keep the glazes at the same thickness from piece to piece and fire them for the same amount of time. Count the seconds to time how long each pot is dipped in the glaze especially when layering glazes. How long should you fire? Years ago, the standard was to fire one hour on low, one hour on medium, then close the kiln and fire on high to the desired cone number. Nowadays, many leave the kiln on low for several hours with the lid cracked, then turn the kiln to medium for several hours with the lid closed before going to high if needed. Fuel-fired kilns may require smaller, more frequent temperature increments. Firing fast with the kiln on high will probably use the same amperage as a kiln being on low for several hours. It is the total amount of fuel or power to fire the load that is important. Lost work from glaze flaws, or cracked pots occurring because of a fast firing all become a waste of fuel and money. Slow, careful bisque firing will give you far more successful pieces in the end. If glaze and/or clay problems do occur, the bisque temperature and the rate of increase are the first thing to inspect. It is up to you to test your clay, talk to your supplier and gather information so that you can make an informed decision about what bisque temperature you need to reach, and the correct duration of firing time. Tim Frederich and Mel Jacobson ASK PMI Send your questions to : Ask PMI Pottery Making Illustrated PO Box 6136 * Westerville, Ohio tfrederich@ceramics.org Although we can't respond to every inquiry, questions used in the magazine will be selected based on interest for our readers. 6 PotteryMaking Illustrated JanuarylFebruary 2005
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10 Getting Started by Snail Scott Building with Coils (Part I) Y BASIC TECHNIQUES ou can build almost any form imaginable, from delicate pottery to huge sculptures, with coils. There are several ways to form coils, but the most widely used is the simplest: Taking a lump of clay, squeezing it into a sausage shape and rolling it on a tabletop. Rolling a basic coil is easy to do with a little practice. If you ve never rolled a coil before, you may find it difficult to achieve a truly round coil. If you re having trouble getting round coils, go slowly. Try not to bear down too forcefully, and try to use your whole hand from your fingertips all the way to your wrist. Another technique you might find helpful is rolling the coil from a different starting point with each pass, either by picking up the coil and moving it or by shifting the position of your hands. It s important to maintain an even thickness over the length of the coil. To get an even coil, move your hands back and forth the full length of the coil. When a coil becomes too long to roll in one piece, break it into shorter lengths and continue one at a time. Finally, try not to overwork the clay. When learning to roll coils, there s a tendency to make them too small, overworking the clay Making a coil can be easy. 1 Use your whole hand to roll out the coil. 2 Squeezing clay into a coil can produce varying thicknesses, sometimes desirable for sculpture. 3 You also can extrude the coil. 4 Different-sized dies allow you to extrude the coil needed for a particular project. 5 Size your coils to accommodate the pot you are making. and causing the coils to dry out and crack. Using an extruder is another way to produce perfectly round and consistent coils quite rapidly. Specially shaped coils also are feasible with an extruder, allowing you to make coils that can interlock from one layer to the next. One drawback to using coils made with an extruder is that they may not be as plastic as rolled coils; rolling is very much like wedging, in that it aligns the particles of clay and forces out air bubbles. Not all applications require a round coil. For work that is intended to be curved and even walled, a round coil can be helpful in keeping consistency throughout the piece. But for sculpture, a rough hand-formed or flattened coil may serve as well and save time. Nor do all applications require coils with a consistent thickness. In many cases, the coil can be roughly the same thickness as the intended final thickness of the piece. For larger work, it is helpful to make oversized coils that can be flattened to create greater height from each course of coils laid on the piece. Manipulating the coil by pinching after it is in place allows you to change the thickness and the shape of the piece. When learning to make coils, it s important to remember that a surefire trick for one person may not work for another. Practice and experiment with different hand positions and techniques to help decide which method works best for you. See Part 2 in the March April issue. Snail Scott is a potter who frequently contributes to the clayart listserv, She can be reached by snail@mindspring.com. 8 PotteryMaking Illustrated JanuarylFebruary 2005
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12 Spare Parts by Mel lacobson Sanders TOOLS f you re equipping a studio, one of the most valuable tools to have on hand is a sander. A small vertical belt sander purchased inexpensively from any hardware store can help you make ribs and trimming tools. The sander will pay for itself in no time. To make a simple drum sander, attach a drill chuck to the shaft of a wall-mounted electric motor. Then buy rubber-backing drums, available in a variety of sizes and grits, depending on your need, to fit into the drill chuck. Shaping a throwing rib with a belt sander. Basic throwing tools are easy to make with a belt sander. A 45 -angle cutoff stick made from scrap wood is a good start; use bamboo and the tool will last seemingly forever. It s easy to make ribs for specific shapes and special purposes. Getting a sharp edge on wood or metal tools is also easy with a belt or drum A vertically mounted sander, and will cut the time drum sander, with a and effort needed to shape small table attached, or sharpen a tool. Keep a makes work easy. variety of grit sizes so they can be quickly changed for fast removal of material or for final polishing of an edge. With proper use, sanders can be a safe, efficient and economical way to make tools for the studio. I Ribs and cutoff tools made with a sander. Mel Jacobson, moderator of clay art, can be reached at: melpots@pclink.com. 10 PotteryMaking Illustrated JanuarylFebruary 2005 ADVANCED RAKU TECHNIQUES A collection of articles and information published in Ceramics Monthly dealing with raku. Written by and about artists and experts, these articles cover a wide range of techniques, materials, equipment and recipes. In addition to articles, you ll find a selection of raku-related questions and answers, as well as suggestions from readers over the past 20 years. Order code CA24 I Price $ RAKU In this book author John Mathieson discusses the clays and glazes that are suitable for raku. He also examines kilns and burners, and firing and post-firing reduction. Along the way he takes a look at the work that is being done in this field by an international group of artists. Co-published with A&C Black, London Order code G075 Price $26.95 POTTERY MAKING TECHNIQUES This book provides you with some of the most popular out-of-print techniques published in Pottery Making Illustrated since the first issue was published as a supplement to Ceramics Monthly in You ll find dozens of techniques, tips and projects on wheel throwing, handbuilding, finishing and firing - all presented in an easy-tounderstand, step-by-step format. Order code CA23 1 Price $28.95 BARREL, PIT, AND SAGGAR FIRING This Ceramics Monthly Handbook reflects the growing interest in pit firing and related techniques. The articles included here were carefully selected to illustrate the wide range of approaches to barrel, pit and saggar firing. Works ranging from wheel-throwm and coil-built pots to complex sculpture are tied together by a similarity in the firing process. Order code CA17 Price $28.95 ORDER ONLINE See our complete collection at or call us at {614)
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14 Beyond Basics by John Toki Sieving Ceramic Materials ADVANCED TECHNIQUES This sieve is excellent for large quantities of liquid glaze or slip. Turning the handle rotates brushes that efficiently force material through the screen. It is available with removable screens ranging in mesh size from Notice the gloves worn for safety. If you want greater control over your finished ware, be sure your studio is equipped with a variety of sieves. You can use a sieve to filter debris from a dry or liquid glaze or slip; remove particles that clog spray guns and airbrushes; eliminate clear surface blotches caused by large frit particles; smooth lumps in low-fire casting slip caused by talc or clay; and prevent surface bumps caused by feldspar as it emerges at high firing temperatures or second firings. Routine sieving of glazes and slips prevents problems such as glaze settling, unevenly fired colors, crazing, crawling, surface peeling, and glaze pitting. These problems may be caused by contamination from large or hard particles from chemicals like frits, zinc oxide, wollastonite, clays and gums. Or they may be the result of clumping caused by poor manufacturing or improper storage in a damp studio or warehouse. Whatever the case, sieving glazes and slips creates a homogenous mixture that helps prevent these problems. Although you can sieve glazes either dry or suspended in liquid, sieving liquid is preferable. It s Suggested Sieve Sizes Project Mesh Reason to Sieve Glaze Eliminates lumps, evens brushstrokes Underglaze Evenly blends clays, gums, stains, oxides, colorants Engobes, Slips Removes lumps when refining Low-Fire Casting Slip 30 Removes lumps and debris Porcelain Slip Improves consistency Dry Chemicals 8-I00 Removes chunks formed by moisture during manufacturing. Refines particle size for many chemicals. * *Wollastonite, zinc oxide, borax, some feldspars and frits. faster and eliminates problems with dust. When blending or refining glaze or body stains, dry sieving is preferable. Dry sieving also is recommended when you re making base glazes, underglazes or engobes, or when the glaze batch you re making is too large to store over time as a liquid. John Toki is a ceramics artist, teacher and ceramics supplier in Berkeley, California. He can be reached at Leslie Ceramics Supply: (510) Top: A small test sieve is handy for processing tiny quantities of materials and glazes, and fits over pint jars. Middle: An economical plastic framed sieve (available in different mesh sizes) is also good for sieving glazes in small quantities. A flexible rubber rib is recommended to force the material through so no damage will occur to the screen. Bottom: A durable metal frame sieve is more expensive but has a longer service life; also available in multiple mesh sizes. PotteryMaking Illustrated JanuarylFebruary 2005
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16 Great throwing ideas, one beautiful casserole One of your first pots was probably a bowl. And if you can throw a bowl, you re on your way to making a covered casserole, which is simply two bowls inverted over one another. Though simple conceptually, throwing a covered casserole will take considerably more skill than throwing your first bowl. You ll need to center the clay perfectly in order to form the gallery the platform where the lid rests. You ll need practice to judge how far to stretch the lid before it starts to sag. And you ll need an aesthetic eye to decide how each part should relate to the others in size and shape, and to the casserole as a whole. Mastering these details will help you create a finished casserole as beautiful as it is functional. Before you start, you need to make key decisions about the way the lid and casserole fit together, what clay you ll use, and how you ll finish the casserole. For my covered casserole, I opted to use a gallery in the rim of the bottom section to support the lid. This classic Continued on page 18
17 THROWING THE BOTTOM SECTION W eigh out your clay, center it on the wheel, open and raise the walls, and finish the rim and the gallery for the lid. Take a measurement of the exact diameter of the outside edge of the gallery rim. I throw the parts for my casseroles on 12-inchdiameter bats allowing for easy removal of the forms without any distortion. While forming the gallery with your left index finger, use the locked fingers of your right hand to support the clay. 1 Center the clay fairly low (curved dark line), then open the centered clay (light line) using your fingers. Push down and pull outward, bracing your hands against each other for support. 2Lift the clay, using pressure between the fingers of each hand, and move it upward and outward into the bowl shape. Leave the rim slightly thicker than the wall in preparation for adding the gallery. At this point the bottom should be about 5/8 inch thick. 3Compress the bottom to about inch thick with the flat part of your fingers or a rib to prevent S cracks. Remove any excess water with a damp sponge. Split the rim with your index finger and change the wall direction so the gallery does not protrude into the bowl. Refine the final form and remove any excess clay from the bottom outside edge of the casserole. You can now measure the gallery s diameter with calipers or a ruler. THROWING THE LID W eigh out your clay, center it on the wheel and proceed to throw the form for the lid. It may require some practice to develop the correct size mass of centered clay in relationship to the final diameter of the lid. Over time, you will learn to throw with less water. Using your fingertips to make a minimum amount of drag on the clay allows you to compress and extend the clay farther out without it collapsing. Your fingers should work together to form the near horizontal lip on the lid. Be careful that this lip does not become too thin. 1 Center the clay fairly low (curved dark line), open the centered clay (light line), and move the clay upward and outward to make a very shallow bowl form. The walls should be thick at this point to allow enough clay to be pulled up and out to form the lid. 2Continue pulling the shallow bowl form. As the walls become increasingly horizontal, be careful to leave a broad enough base for support. Notice that the inside of the form is concave and not flat. 3Establish the final form by altering the rim so that the outer part is almost horizontal. This strengthens the form to help prevent warping and serves the aesthetic function of making the lid appear to continue through the gallery to the bottom section of the casserole (see page 17). Use the measurement that you made for the gallery to measure the outside diameter of the lid so there will be a snug fit. JanuarylFebruary 2005 PotteryMaking Illustrated 15
18 TRIMMING THE CASSEROLE BASE AND LID W hen both forms are leather hard, carefully invert each one and trim the excess clay. Take your time and be neat the marks you make on the pot will remain for the life of the pot. You probably have a favorite trimming tool or you may like to make your own tools. I use wire loop tools because I feel I have more control. Use the tools that give you the most control and the finished results you desire. Polish all trimmed areas with your finger or a rib to eliminate the rough surface. Use a loop tool to trim the inside of the foot ring. IWhen the form is leather hard, place a bat on the rim so you can sandwich the pot between bats and flip it over to avoid flexing the form. (A flexed pot may cause later problems such as warping or cracking.) Center the pot using clay wads to hold it in position while trimming. Note: Many potters trim on a bat covered with a layer of foam rubber, eliminating the need for clay wads to hold the pot. 2Trim the outside of the casserole base first and establish the width of the foot ring, usually the same width as the rim of the casserole. Trim the bottom deep enough so you can glaze the area inside the foot ring. (A minimum of 3/16 inch.) Slightly bevel the inside and outside edges of the foot ring about 1/8 inch. This will allow for easier waxing and glazing. 3Turn over the leather-hard lid, center and secure with clay wads. Trim the lid to an even thickness following the inner contour. Allow to dry to firm leather hard before applying the handle. 16 PotteryMaking Illustrated January/February 2005
19 SIDE AND TOP HANDLES o nce the pot has reached firm leather hard, it is time to apply your handles. You can either pull or extrude (or a combination of both) handles for the casserole and lid. When ready to apply, score and slip the area of attachment and add the handles. Pay attention to the center of the lid and the handle placement. You can keep a container of slip from your throwing bucket, with some vinegar added, for use in attaching handles. After adding the handles, cover the pots with plastic so they will dry slowly. This may be overkill, but my handles never break off during drying or firing. ISide handles These handles are extruded using a die design based on the cross section of a pulled handle. The ends are cut at an angle. The locations of the two handles are marked on the casserole, then scored and attached with slip. 2Tendril top handles This handle uses the same die as the side handles. A 6-inch section is pulled into a gradual taper about inches in length. The inch or so of clay that was held while pulling is cut away at an angle. The thick end is attached with slip to a scored area about 1 ½ inches from the center of the lid. Loop the handle over a couple of times before securing the thin end with slip. You also can use a bisque stamp to reinforce the joint or for decoration. 3Strap handles Using an extrusion die just slightly larger than the one for the side handles, extrude and pull a strap handle about 9 inches in length. Attach the thick end with slip and loop the handle just high enough for easy finger access. Using the extra clay at the end of the strap handle, add a couple decorative folds and attach to the lid. Note how the outer curve of the lid appears to continue through the gallery to the base. The base end of the handle has been attached and the tendril handle is being formed. Be sure to get the main component centered on the lid. JanuarylFebruary 2005 PotteryMaking Illustrated 17
20 Casserole, 7½ inches (19 centimeters) in diameter, stoneware, tendril handle with "Cuerda Seca" decoration, fired to Cone 10. form makes it relatively easy to get a good fit. Leaving the gallery and the rim of the lid unglazed allows you to fire the two pieces together. This prevents warping and helps maintain a tight, accurate fit. The clay body you select should be durable enough for oven use. In this case, I picked a commercially made stoneware clay that fires to Cone 10 in reduction, but there are many clay bodies with a wide variety of firing ranges that will work. You may want to ask your ceramic supplier for recommendations. Finally, be sure the glazes you use are food safe. Most commercial glazes include this information on their labels. If you are making your own glazes, you should have them tested. The finished casserole is dried slowly and bisque fired. Look for Part 2 in the next issue, in which Leon will present his Cuerda Seca decoration for glazing the casserole. Leon Roloff taught high-school ceramics for 35 years and has been retired from teaching for nearly 11 years. You can comments to Leon: lroloff@grossmont.kl2.cams. 18 PotteryMaking Illustrated January/February 2005
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22 A combination of building techniques that can be applied to many forms By Gaylon Dingier Finished Indian bottle, 18 inches (46 centimeters) in height. My pursuit of unique bottle forms took an unusual twist when a friend with an interest in American Indian culture mentioned that Indians believe they can sense spirits within rocks. After a good deal of trial and error, I found a way to make Indian images or spirits within ceramic vessels shaped to resemble bottles or the smooth stones of riverbeds my own version of Indian bottles and stones. This process involves handbuilding, throwing and sculpture techniques, but starts with making a simple mold made from Styrofoam to make the smooth, stoneshaped vessel. Styrofoam molds can be made from new sheets of foam bought at a lumberyard, thick foam salvaged from construction sites, or appliance packaging. For the Indian bottle created here, I found thin pieces and glued them together. Making the Mold Draw an outline of the bottle onto the foam and cut to size. Glue the foam pieces together with a hot glue gun to make a solid block, and following the outline drawn on top, saw out the oval. After trimming the block, you can shape the final stone using a rasp and finish the form by smoothing with an electric sander. Do this outside the studio to make cleanup fast and easy. If you notice cracks during this finishing process, simply fill them in with spackling compound. After the compound dries, sand the surface again. The mold should be reasonably smooth. When finished sanding, wipe off the dust with a damp cloth and paint the mold with a fast-drying latex primer. It usually takes two or three coats to seal the mold completely. At this point, the mold is ready for use as a form for shaping a clay slab. CAUTION: To protect your health, always wear a dust mask when shaping and sanding the Styrofoam. Making the Form Roll out a slab of clay slightly larger than the foam model. If you don t have a slab roller, a rolling pin will work just as well. Place a piece of plastic wrap on the clay and lay the mold on the plastic wrap. Lift the clay, plastic wrap and mold, and flip so the clay will collapse over the 20 PotteryMaking Illustrated January/February 2005
23 top half of the mold. Carefully push down the clay and trim off the excess so its edge is even with the center line on the side of the mold. You may find that using a ruler or a small board is helpful. After the clay sits on the form for a period of time (depending on temperature and humidity), it can be pulled from the mold. The plastic wrap sticks only to the clay and is easily removed. The clay should be slightly pliable, but stiff. If it s too flexible (not leather hard), put it back on the mold before removing the plastic wrap and let dry a little longer. If it s too dry, it may shrink and crack, so experiment to find the right consistency for your clay body. When firm, put the first half of the mold in an airtight plastic bag until you are ready to start the next step. Repeat the above procedure for the other side of the mold and keep both parts in airtight bags so they don t dry out. NOTE: I usually cover two or three molds with clay so I have several pieces under construction at the same time. While one bottle is drying, I can work on another. Making the Face This is the most difficult and time-consuming part of the project. Each face is sculpted separately inside the first bottle half, using Native American themes in hair and dress. Studying old photos from the 1800s is a great way to get ideas, clothing and themes for accurate renditions. It can take several hours sometimes longer to model the face, including beads, hair, feathers and clothing. For this project, I chose a deep, round bottle so the face would be in high relief off the back wall. Start the face by using the pinchpot method and then cut a slab that can be attached to provide height. Score both surfaces, apply slip, push the two pieces together and smooth out the seams. After you have made the face form, check the size in relationship to the bottle and sketch facial proportions onto the clay. You can wad up plastic bags inside the face for support. A spray bottle or mister is perfect for keeping the clay moist. If the clay begins to feel dry, give the piece a light spray of water. BUILDING THE FORM 1 Draw the outline of the bottle onto the foam. Cut the blocks to size and glue them together to make a solid block using a hot glue gun. 2 Following the outline, saw out the oval shape. Finish the form using a rasp and smooth with an electric sander. Paint with a latex primer to seal the mold. 3 Roll out the slab of clay slightly larger than the foam mold on canvas. Place a piece of plastic wrap on the clay and place the mold on the plastic wrap. 4 Use the canvas to help flip the mold so the clay will collapse around it. Push the clay down and trim off the excess following the center line of the mold. 5 After the clay becomes leather hard, pull the mold up. The plastic wrap sticks to the clay but not the mold. JanuarylFebruary 2005 PotteryMaking Illustrated 21
24 FACE VALUES 1 Cut a slab that can be rolled into an oval to make a base for the pinch-pot face. Use slip to press the two pieces together and smooth the seams. 2 After the face form is built, check to see if the size fits the bottle. 3 Sketch facial proportions onto the clay. 4 Slowly press in the eyes, build a nose, mouth, muscles, hair, etc. 5 Fit the face to the bottle, marking where they touch. Score, apply slip and press together. Reinforce the connection by adding more slip and clay into the seam. 6 Add the final details (hair, feathers, etc.), and put in a plastic container to sit overnight. Finish the details when clay has firmed up. Using the sketched proportions, slowly create the face by pressing in the eyes, adding a nose, cutting a mouth, building up facial muscles and forms, pressing in a neck, and making hair. Place the face in the bottle half and mark the clay so you ll know where to score and apply slip. Score the bottle and back of the face, apply slip and press. To reinforce the face and bottle connection, add more slip and a small amount of clay, and smooth it into the seam using a modeling tool. Once everything is joined, slowly add more details hair, feathers and beads to tie the face to the bottle. It s a good idea to put this half in a plastic bag and let sit over night. This allows the moisture to even out and the clay to firm up, making it easier to add the final details. NOTE: Identifying the front half of the bottle by marking it with an F will help you remember which side of the bottle will be cut to reveal the face after the two halves have been joined together. joining the Bottle Parts Once the bottle pieces are leather hard, it s time to put them together to see how well they fit. If necessary and most often it is trim the pieces so they are flush. Score the two surfaces, apply slip and stick the two halves together. Inspect the seam around the bottle while pressing, making sure it s secure and well connected. Double 22 PotteryMaking Illustrated JanuarylFebruary 2005
25 check to be sure one side didn t separate while the other side was pressed. To make the connection even stronger, you can smooth the seams together with a wood modeling tool and add a coil of clay down the seam. Blend the coil of clay into the surface, then tap the seam with a small wooden paddle to compact the clay and to reshape the form if necessary. The Neck It is a good idea to handbuild or throw several bottle necks/tops and keep them in an airtight plastic box, spraying them occasionally to keep from drying out. With this supply, you can easily test several necks on a bottle until one looks right. (If the bottle doesn t have a neck, I refer to the piece as an Indian stone. ) Place the neck on the bottle, mark the outside and inside edge to show exact placement and cut the hole. Trim the bottom of the neck so it will fit onto the hole in the bottle. Score and slip, press together firmly and smooth into the bottle, using your fingers and wooden tools both inside and out. The Window While working on the bottle, try to think about the window or hole shape that will reveal the face inside. Often the shape of the bottle will determine the shape of the window. Cut a small hole in the front to see where the face is located, then enlarge the window until it frames the face nicely, using a wooden tool to smooth the edge. In order to make a concave recess that frames and reveals more of the face, and holds inlaid turquoise-colored tiles, draw a ring on the front of the bottle and cut it out. To make it concave, turn the clay ring around and rejoin it to the bottle. If you want to make the ring more concave, use your hands to stretch the clay. You may have to spray the piece with water to make it more pliable if it has dried too much. The cut out ring is fitted and stretched to match the hole, scored, brushed with slip, and reattached to the bottle. You can use a spoon to smooth the curve in the concave opening. JanuarylFebruary 2005 PotteryMaking Illustrated
26 FINISHING THE FORM 1 Put the two halves together, making sure to score and slip. Knead and smooth the seams. Add clay down the seam, smooth and blend for reinforcement. 2 Use a wooden paddle to tap the seam and reshape the bottle form. 3 Place a neck on the bottle, marking the edges for exact placement and cut a hole. Score and slip the bottle and neck, and press together. Smooth the seams. 4 Cut a hole in the front of the bottle, enlarging it until it frames the face. Smooth the edge with a wooden tool. NOTE: Using this mold process leaves a seam on the inside of the wall that s visible through the window. Cleaning up this seam with your fingers or a tool enhances the appearance of the bottle. Adding Colored Tiles For your inlaid colored porcelain tiles, draw a ring in the concave surface. Cut slits inside this ring, spray with water to soften the clay and slowly depress the clay using a modeling tool. Cut the slits in sections, depressing and progressing around the ring. Don t stretch the clay too fast. If necessary, add pieces of clay to weak depressed areas. Cut out small boxes in the depression where the porcelain tiles will be inlaid. CREATING A DECORATIVE RING 1 Cut out the front making a clay ring, and flip over to use as a concave recess. 2 Smooth the inside seam. 3 Stretch the ring to make it concave. Score, slip, and reattach to the bottle. 4 Smooth the curve of the concave opening. 24 PotteryMaking Illustrated January/February 2005
27 Turouoise Tiles To make the turquoise tiles, mix 120 grams of wet porcelain with 1 gram of cobalt oxide and 1 gram of green chromium oxide. These are metal oxides, so be careful when handling. If you increase the oxides slightly, the colors will be more intense. Knead the wet clay and oxides together until mixed thor- JanuarylFebruary 2005 PotteryMaking Illustrated 25
28 MAKING TURQUOISE TILES 1 Draw a ring around the window for the inlaid turquoise. While cutting slits in sections, depress the ring. 2 Thoroughly mix the porcelain and oxides. Roll a slab and cut into small tiles. 3 Draw small boxes in the depression. Score and slip the boxes and add the turquoise until the ring is filled. The porcelain will swell after firing and look like turquoise. oughly. You can even force the mixture through a screen several times to ensure it is uniform. Failure to mix well may cause white porcelain spots to show up in the finished tiles. When you re satisfied with its uniformity, roll out the porcelain and cut into tiles. Trim and press the tiles into the scored and slipped boxes. Use a small tool to clean up around the tile design. When fired, the porcelain seems to swell and round itself off slightly. Place the tiles until the ring is filled. Using a variety of sizes and spaces makes for a more interesting design. To finish the bottle, fill dents and scratches with clay, smooth rough areas, burnish with a spoon and, in general, clean up the look of the finished piece. Oh yes, one more thing... add your signature! Color and Fire Let the bottle dry slowly and evenly in a plastic bag. As the bottle dries, continue to smooth and sand surfaces that need attention. After allowing the bottle to air dry completely, bisque fire very slowly. I have had many bottles burst where the walls were too thick and too damp (usually where the face was attached). You can stain the bottles after they have been bisqued, though the stain does not cover up the porcelain like a glaze. Cover the entire piece with stain and wipe off the excess. If you do glaze the pieces, a matt glaze will give the bottles a stonelike 26 PotteryMaking Illustrated January/February 2005
29 SPIRITS IN THE STONES M ike Bacon, a scholar of Native American culture, says there s a strong connection between Native Americans and nature. Though they share a common belief in The Great Spirit, Native Americans also believe the world is filled with other spirits associated with natural and supernatural phenomenon, such as the wind, tree, and rocks. These spirits, they believe, have powers that can be passed on to other objects or human beings. Native Americans use the term medicine to refer to an object that they believe has control over natural or magical forces, such as a lock of hair, dirt or a feather. Not all medicine is protective or healing, however. Some woodland tribes, says Bacon, would break their pottery at the end of winter to chase away evil spirits and start anew in the spring. For many Native Americans, rocks represent age, eternity and wisdom. Gaylon Dingler s Indian bottles and stones were designed to honor the spirit and culture of Native Americans. patina. Shiny glazes don t yield the same natural look. You also can use the porcelain by itself, with no stains, to create white inlay that resembles bones or flint. You should experiment with porcelain and coloring stains to see what combinations might be useful. Use Your Imagination Foam shapes may help you create a variety of difficult ceramic forms. For example, you can make any shape by covering the foam form with plastic wrap and draping it with clay. Or you can press or paddle slabs of clay over the form, sometimes leaving gaps between the strips or covering completely. You must let the clay stiffen, but not to the point that it shrinks so much that the clay splits. After the clay stiffens, you can cut it into pieces, take the mold out, and put the parts back together using slip, creating your own design. This foam form technique offers potters new ways to make ceramic compositions and creations creations like my Indian bottles and stones. Gaylon Dingier is a retired art teacher residing in Tyler; Texas. He can be reached by gding@cox.net. JanuarylFebruary 2005 PotteryMaking Illustrated 27
30 28 PotteryMaking Illustrated January/February 2005
31 Three ways to add depth to your glazes By Lisa Bare Culp A s a potter and in-home instructor for 10 years, I ve always mixed my own glaze, or relied on other professionals who mix dry glazes to my specifications. Recently, an idea for a single pot challenged me to experiment with commercially made glazes. The outcome has been succesful with vibrant new color selections, time savings and the convenience of readily available glazes screened for toxicity all this without compromising my workspace or my standards. What changed my thinking on commercially prepared glazes was my desire to introduce bold new colors into my work. I envisioned a piece with contrasting matt black-andwhite slip surfaces offset against a single area glazed in vibrant red. My local supplier recommended a foodsafe, nontoxic red glaze, Mayco s Stroke &c Coat Cone 06. Early Experiments Early tests resulted in pieces with dramatic and beautiful contrasts "Fish Bowl," matt white glaze over commercial glazes, fired to Cone 6. between my porcelain slips and the red glaze. In one test, I used Stroke & Coat SC-73 Candy Apple Red, to highlight areas of bisqueware. In another, I used SC-74 Hot Tamale. Sometimes I applied the glaze with a big brush in a single, expressive stroke. Other times, I squeezed the colors from a slip trailer and a turkey baster. After these loose applications, I dipped the entire piece in my usual Cone 6 glazes. Because of their gum content, the commercial glazes resisted my glazes slightly, making the bold strokes of color come through vividly. Stroke edges were blended and their colors softly striking against the Cone 6 palette. The outcome was as satisfying technically as it was aesthetically; I was satisfied with the melt (Stroke & Coat is a glaze, not an underglaze), the color and the absence of pinholing or other major flaws at Cone 6. A New Tool Further experiments with sgraffito, layering, mixing with slip and stoneware glazes, and multiple January/February 2005 PotteryMaking Illustrated 29
32 ASPARAGUS TRAY Pouring Squeeze a large amount of Stroke & Coat SC-73 Candy Apple Red across the interior of a bisquefired bowl. Use a 2-inch brush to apply a thin coat of Mayco's Elements Chunkies EL 203 Coal Dust (this is a low-fire effect glaze with crystals) over the Candy Apple Red. A nice feathered edge is created when the piece is dipped into a Cone 6 black glossy glaze. FISH BOWL I Carving Apply a thick coat of Mayco Stroke & Coat SC-71 Purple- Licious and SC-74 Hot Tamale with a large brush to the interior surface of a leather-hard bowl. Once the colors are slightly dry, the design is carved through the glaze with a loop tool, then bisque fired to Cone 08. Dip the entire piece twice in a Cone 6 matt white glaze and fire to Cone 6 in oxidation. The commercial colors show well through the white matt. Note: If the carved lines are too fine they may fill in when the glaze melts. 30 PotteryMaking Illustrated January/February 2005
33 GEAR DISH Layering On a heavily textured, bisque-fired piece, apply a Cone 6 porcelain black slip as a stain, wiping off the high spots with a damp sponge. Use a 2-inch brush to apply Stroke & Coat SC- 71 Purple-Licious to the high spots with a dry brush technique. Next, dry brush Mayco's Stroke & Coat Red SC-74 Hot Tamale and SC-27 Sour Apple onto the interior. Apply a thick coat of the red glaze in isolated areas to obtain a bright color. Apply wax resist to the interior surface of the piece and allow to dry. Dip the entire piece in a Cone 6 blue glaze. Below: "Gear Dish," slabbuilt stoneware. firings have opened up commercial glazes as a new artistic tool albeit an unexpected one to share with students. They have learned the importance of experimenting with new surfaces, new materials, combining techniques and achieving balance with different kinds of material. If you d like to experiment with commercially prepared glazes, I ve included three of my projects for you to try. Mixing my own recipes will always be an important part of understanding the science behind the art of pottery making. But successfully integrating commercial glazes in the mix is just one more way to pursue the function and beauty of ceramics. Lisa Bare Culp is a potter residing in Columbus, Ohio. She specializes in ceramic restoration (see and can be reached at: bareclay@wowway.com. JanuarylFebruary 2005 PotteryMaking Illustrated 31
34 Wood Ash: Preparing for Glazes Clean wood ash enhances your glaze palette by Kathy Chamberlin Early in my career, I experimented with the use of ash in glazes and on surfaces to mimic some of the effects of wood firing in a high-fired gas kiln. Wood ash contains soda and potash, soluble alkaline compounds that can irritate or burn your skin, so I made considerable efforts to wash the ash to remove its caustic hazards. At the time, I found I didn t have the patience, knowledge or resources for proper ash preparation. Recently, I started experimenting again with hardwood, softwood and vegetable ash, and I ve developed a simple way to prepare ash for the glazing process. You can follow this method to prepare wood ash for your glazes and decoration. Use ash in your glazes that call for wood ash or apply it over the top of a glaze surface immediately after glazing (while still damp). It is a good idea to test your ash glazes and application methods when using
35 CLEANING WOOD ASH The Five Steps to Clean Ash 1 Gather wood ash from a wood stove or fireplace. Use a galvanized bucket for safety in case there are still hot embers. Be sure the ash is from a fire in which only wood has been burned, not trash. 2Once the ash is totally cold, sieve and discard the remaining charcoal and wood debris. Use a metal mesh strainer a metal window screen works well and collect the ash in an enamel or plastic bucket for rinsing with water. 3Using a plastic or enamel bucket, rinse the sieved ash in water. When adding water, the ash solution shrinks and loses volume. I try to prepare a lot of ash at one time. Use large containers and try to do this step outside or in a garage where water is available. 4Most of the ash will settle to the bottom of the containers. The water is poured off and the ash is rinsed again, 3-4 times. Leave the ash to separate or settle itself from the water for a few days. The water will evaporate or can be poured off leaving a solid mass of dry ash. To speed the drying process, spread the ash out on newsprint or cloth and place it in the sun. 5Once the ash has dried, it needs final screening through a sieve. I have found 80 mesh works best for me to prepare the ash for my use in and on glazes. Store the ash in covered containers until ready for use. Safety tip: Wear plastic gloves to protect your hands. When beginning to rinse the ash, the liquid is very caustic and can bum your skin. Protect yourself against inhaling the ash dust by wearing a face mask or respirator. JanuarylFebruary 2005 PotteryMaking Illustrated 33
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