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Glazeless (top) and with glaze (bottom): A1 (bentonitic), A2 (ball clay), A3 (stoneware), 3B (porcelains), 3C (lignitic ball clay), 3D (silt). The bottom row has also shows soluble salts (SOLU test).
Tests |
Soluble Salts
Evaluate and compare the solubles salts content in clay bodies and materials |
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Materials |
A1 Ball Clay
It is very high in iron stone (pyrite) concretions and soluble iron salts, a heavily stained bentonitic ball clay. |
Materials |
A3 Stoneware Clay
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Materials |
A2 Ball Clay
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Materials |
B Clay
|
Materials |
3C White Ball Clay
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Materials |
3D Clay
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Glossary |
Reduction Speckle
A sought-after visual effect that occurs in reduction fired stoneware. Particles of iron pyrite that occur naturally in the clay melt and blossom up through the glaze |
Glossary |
Efflorescence
A common problem with dry and fired ceramic. It is evident by the presence of a light or dark colored scum on the dry or fired surface. |
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