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This is G1947U clear glaze with 8% Mason 6021 encapsulated red stain added. The body is P700, a Grolleg kaolin porcelain. The one on the right, having significantly reduced clouding within, has one tiny addition: 2% Zircopax. It is acting as a micro-bubble fining agent, producing a brighter color and smoother surface. But there is a possible problem: These stains are not recommended for use above 2300F. Even though the color is very good, cone 10 is just on the edge of the limit temperature, so suitability for food surfaces would require careful testing for leaching cadmium.
Recipes |
G1947U - Cone 10 Glossy transparent glaze
Reliable widely used glaze for cone 10 porcelains and whitewares. The original recipe was developed from a glaze used for porcelain insulators. |
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Glossary |
Copper Red
The color red is very difficult to achieve in ceramics. The most vibrant red within the reach of the average potter is the color produced by copper in reduction firing. |
Glossary |
Fining Agent
Individual tiny bubbles in a glaze melt can coalesce around the undissolved particles of a fining agent, the growing bubble swallowing others around it and finally exiting at the surface. |
URLs |
https://www.masoncolor.com/reference-guide
Mason Color Reference Guide A large chart showing each stain. The rows are grouped according to type and each row has tags that references temperature capability and chemistry requirement for the host glaze. There are also columns for each element and the rows have check marks for each contained. |
Materials |
Mason 6021 Red Stain
An encapsulated red stain, it has proven better than any other red we have ever tried for glazes. And it works in bodies. |
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