Monthly Tech-Tip | No tracking! No ads! |
A stain-water mix was painted into recesses and an overglaze was applied. This stain is refractory, thus it does not glass-bond with the body. And it repels being wetted by the molten glaze. Thus this problem. The stain needs to be mixed with a stain medium that both supplies a bonding glass and a clay to suspend the slurry and dry harden it. One solution is an addition of Gerstley Borate (enough to melt it to the needed degree) and extra bentonite if needed (to slow the drying time for painting). At a minimum, if the color does repel the glaze a little at least it will be melted.
Glossary |
Stain Medium
It is a mistake to use pure stains for decorating ware. Stains need to be mixed with a ceramic carrier and a working medium to work and fire well. |
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