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This is a cone 6 porcelain mug and glaze. We get this satin matte effect in our test kilns using the PLC6DS schedule. Larger kilns cool slower so this glaze will turn out more matte, possibly too matte. We deal with that by increasing the percentage of glossy base (this is a 15:85 blend of G2926B glossy and G2934 matte). 6% black stain was added. The decal is from Sanbao Studio. On the left, it has just been applied, other than the glossy finish revealing its location, no gold design is visible. But, after the decal firing, using the MDDCL schedule, we get the result on the right.
The G2934 base matte recipe is good for decals because it has a very low B2O3 content. G2926B glossy, on the other hand, has very high B2O3 (boron). Since boron is such a strong flux the glaze melts very early - a decal firing can soften it enough to alter surface appearance (if stained, crystallized or variegated) or create tiny pinholes or blisters.
Glossary |
Ceramic Decals
This process of printing a design (using ceramic inks) onto film-coated paper to create a waterslide transfer. On wetting, the film decal can slide off the backing on to the glazed ware. |
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