These are G2926B clear glazes with stains added and fired at cone 6. The one on the left has 11% Mason 6021 encapsulated red. It is pebbling the surface (even with 2% zircon), it may be at the upper end of its firing range. Possible solutions are faster firing up and down to give the stain less chance to decompose. A lower percentage might help, that would impart a bit of variation where it is thicker and thinner (like the purple one) to add visual interest. A different host glaze, perhaps one with less boron might work better. The purple one has 10% Mason 6304, it is not affecting the glossy glaze surface. But the percentage needs to be higher to prevent the wash-out of color where it is applied thinner.
Glossary |
Encapsulated Stain
This is a type of stain manufacture that enables the use of metal oxides (like cadmium) under temperature conditions in which they would normally fail. |
---|---|
Glossary |
Ceramic Stain
Ceramic stains are manufactured powders. They are used as an alternative to employing metal oxide powders and have many advantages. |
Materials | Mason 6304 Violet Chrome Tin |
Materials | Mason 6021 Red Stain |
Sign up at the home page.