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This is a 45:27:28 Gerstley Borate:Kaolin:Silica base on a dark firing clay body. But tin oxide will do that in almost any cone 6 clear glaze (use one that fits your clay body).
| Glossary | Opacifier Glaze opacity refers to the degree to which it is opaque. Opacifiers are powders added to transparent ceramic glazes to make them opaque. | 
| Materials | Tin Oxide Its principle use in ceramics is as an opacifier in glazes. It is very expensive. | 
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