Table of Contents--Mastering Cone 6 Glazes |
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Foreword |
7
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Preface |
9
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Acknowledgments |
10
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A Note about Safety |
11
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1 |
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Introduction |
13
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Why This Book Is Needed |
13
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What Do We Mean by Stable or Durable Glazes? IsThat Different from “Food Safe” Glazes? |
14
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The Seger Unity Formula and Its Relevance to Our Work |
19
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Conclusions |
21
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2 |
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Basics of Glazing and Firing |
23
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Safety First |
23
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Purchase and Storage of Glaze Chemicals |
23
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Weighing and Mixing |
24
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Glaze Suspension (Flocculents and Deflocculents) |
28
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Bisque Preparation |
30
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Bisque Firing |
30
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Cleaning |
31
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Glaze Resists |
31
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Applying glazes |
32
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Firing |
34
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Loading |
34
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Rate of Firing and Cooling |
35
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Summary |
35
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3 |
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Testing Glazes for Stability and Fit |
37
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Testing for Resistance to Acids |
38
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In-Studio Testing |
39
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Quantitative Testing by a Professional Testing Laboratory |
40
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Interpretation of Results |
40
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Testing for Resistance to Alkalis |
43
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Testing for Resistance to Thermal Shock (Clay/Glaze Fit) |
44
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Testing for Resistance to Knife Marking |
46
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Testing for Wear and Scratch Resistance |
46
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Testing for Chipping Resistance |
47
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Testing for Suitability for Use in a Microwave Oven |
47
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Summary |
49
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4 |
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Making a Stable Glaze |
51
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Rule 1. Have Enough Silica |
52
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Rule 2. Have Enough Alumina |
53
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Rule 3. Thoroughly Melt the Glaze |
54
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Rule 4. Use Moderate Levels of Colorants and Opacifiers |
55
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Guidelines for Improving Glaze Stability |
58
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Guideline 1 |
58
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Guideline 2 |
59
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Guideline 3 |
59
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What about Limit Formulas? |
59
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Summary |
60
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5 |
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Fitting Glazes to Your Clay Body |
61
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Understanding Crazing, Dunting and Shivering |
61
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Crazing |
61
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Shivering or Dunting |
62
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Determining Clay/Glaze Fit for Your Materials |
62
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Understanding Dilatometer Measurements |
63
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Expansion Test Glazes and How to Use Them |
67
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Interpreting Calculated and Actual Measured Expansion Numbers |
68
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Are Calculated Expansion Numbers Useful? |
70
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Expansion Test Glazes |
71
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Summary |
81
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6 |
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Stoneware and Porcelain Glazes |
83
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Base Glazes |
86
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High Calcium Matte/Semimatte Glazes |
86
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General Purpose Glossy Base Glazes |
92
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Glossy Base Glaze 2 |
96
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A Clear, Glossy Liner Glaze |
97
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A Zinc Semimatte/Glossy Base Glaze |
97
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Specialty Glazes |
102
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A Chrome/Tin Pink Glossy Glaze |
102
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Waxwing Brown |
104
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Waterfall Brown |
106
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A Cone 6 “Maiolica” Glaze |
108
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Alumina and Magnesia Matte Glazes |
110
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Summary |
110
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7 |
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Developing Your Own Glazes |
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Gloss versus Matte |
111
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Level of Transparency/Opacity |
112
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Solid color versus variegated glazes |
112
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Ron’s Approach to Glaze Development |
113
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John’s Approach to Glaze Development |
116
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Summary |
118
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Bibliography |
119
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Glossary |
121
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Postscript |
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Appendices |
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A: Recommended Materials |
130
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B: The Seger Unity Formula |
133
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Background |
133
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A Simple Example |
134
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The Computer’s Role in Glaze Formulation |
136
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C: Programs for Glaze Calculation |
138
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D: Testing Laboratories for Glazes |
141
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E: Firing Cycles for Electric Kilns |
143
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F: Materials Analyses |
145
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G: Glazes Used for Development of Rules |
153
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Rule 1 (Have Enough Silica) |
153
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Rule 2 (Have Enough Alumina) |
155
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Rule 3 (Thoroughly Melt the Glaze) |
158
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Rule 4 (Use Moderate Levels of Colorants or Opacifiers) |
158
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H: Useful References for Leaching Data |
159
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I: Limit Formulas for Cone 6 Glazes |
162
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Index |
163
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