Monthly Tech-Tip | No tracking! No ads! |
Commercial underglaze colors fired in a flow tester. Underglazes need to melt enough to bond with the underlying body, but not so much that edges of designs bleed excessively into the overlying glaze. A regular glaze would melt enough to run well down the runway on this tester, but an underglaze should not flow at all. The green one here is clearly not sufficiently developed, its base needs more frit. The black is much too melted, its base needs less frit. The pink and blue are also melting too much. Clearly, underglazes recipes need individual attention so they melt to the same degree.
Glossary |
Underglaze
A intensely pigmented and highly opaque brushing compound meant to be applied to leather hard pottery and covered with a transparent overglaze. |
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Glossary |
Bleeding colors
In ceramics, the edges of overglaze and underglaze color decoration often bleeds into the over or under glaze. How can this be avoided. |
Glossary |
Silk screen printing
Silk screen printing is one of the best options for hobbyists and potters to reproduce crisp and detailed decoration. But there are many details to know. |
Glossary |
Engobe
Engobes are high-clay slurries that are applied to leather hard or dry ceramics. They fire opaque and are used for functional or decorative purposes. They are formulated to match the firing shrinkage and thermal expansion of the body. |
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