The Essential Guide to Mastering Glazing
Professional craftsmen John Hesselberth and Ron Roy present this invaluable resource for potters working with cone 6 glazes. Compared to the more traditional cone 9 method, the relatively lower firing temperature of cone 6 (2,232°F) results in faster kiln heating and cooling times, and the availability of a more diverse color palette for artists to work with. The different temperature range requires compatible glazes. Beyond that, Mastering Cone 6 Glazes provides a wealth of information for all potters, firing at a variety of temperatures, especially on the subjects of durability and cooling. We at Echo Point Books learned about this book from a veteran professional potter, who urged us to bring it back into print. We’ve since learned that Mastering Cone 6 Glazes is simply the best book on the topic. It describes all of the elements integral in the cone 6 process in clear, easy-to-understand language. The book begins with a thorough and accessible examination of glaze theory, and features detailed discussions about glaze durability and fit, strength testing, shivering and crazing, and color leaching and fading. It also includes detailed recipes for a wide variety of highly effective and aesthetically appealing glazes. Readers need not be masters of ceramic science themselves; expert authors Hesselberth and Roy present the relevant chemistry and technical material in accessible terms. They help you understand the fundamentals of the process, enough so that eventually you’ll even be able to formulate your own glazes. They also emphasize safety, both in the studio and for users of the pottery, always with an eye on form and function. Mastering Cone 6 Glazes is an essential resource for do-it-yourself artists of all ages and experience levels.
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|Publisher:||Echo Point Books & Media, LLC|
|Edition description:||Reprint ed.|
|Product dimensions:||8.00(w) x 10.00(h) x 0.44(d)|
About the Author
Ron Roy has been a studio potter since 1963. His work is shown in many publications, including Robin Hopper's revision of Danial Rhodes' Clay and Glazes for the Potter and The Ceramic Spectrum, Richard Zakin's Ceramics-Ways of Creation, and Karen Ann Wood's Tableware in Clay.
Table of Contents
A NOTE ABOUT SAFETY
Why This Book Is Needed
What Do We Mean by Stable or Durable Glazes? IsThat Different from “Food Safe” Glazes?
The Seger Unity Formula and Its Relevance to Our Work.
2 BASICS OF GLAZING AND FIRING
Purchase and Storage of Glaze Chemicals
Weighing and Mixing
Glaze Suspension (Flocculents and Deflocculents)
Bisque Preparation ...........
Rate of Firing and Cooling
3 TESTING GLAZES FOR STABILITY AND FIT
Testing for Resistance to Acids
Quantitative Testing by a Professional Testing Laboratory
Interpretation of Results
4 MAKING A STABLE GLAZE
Rule 1. Have Enough Silica
Rule 2. Have Enough Alumina
Rule 3. Thoroughly Melt the Glaze
Rule 4. Use Moderate Levels of Colorants and Opacifiers
Guidelines for Improving Glaze Stability
5 FITTING GLAZES TO YOUR CLAY BODY
Understanding Crazing, Dunting and Shivering
Shivering or Dunting
Determining Clay/Glaze Fit for Your Materials
Understanding Dilatometer Measurements
Expansion Test Glazes and How to Use Them
Interpreting Calculated and Measured Expansion Numbers
Are Calculated Expansion Numbers Useful?
Expansion Test Glazes
6 STONEWARE AND PORCELAIN GLAZES
High Calcium Matte/Semimatte Glazes
General Purpose Glossy Base Glazes
Glossy Base Glaze 2
A Clear, Glossy Liner Glaze
A Zinc Semimatte/Glossy Base Glaze
7 DEVELOPING YOUR OWN GLAZES
Glossy versus Matte
Solid Color versus Variegated Glazes
Ron’s Approach to Glaze Development
Johns Approach to Glaze Development
A' RECOMMENDED MATERIALS
B THE SEGER UNITY FORMULA
C PROGRAMS FOR GLAZE CALCULATION
D TESTING LABORATORIES FOR GLAZES
E FIRING CYCLES FOR ELECTRIC KILNS
F MATERIALS ANALYSES
G GLAZES USED FOR DEVELOPMENT OF RULES..
H USEFUL REFERENCES FOR LEACHING DATA
I LIMIT FORMULAS FOR CONE 6 GLAZES