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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 | 
| 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 A buff burning, high temperature somewhat sandy stoneware having ready-to-use plasticity. | 
| Materials | A2 Ball Clay A refractory ball clay with pyritic iron impurities. | 
| Materials | 3B Clay A fine-grained, tan burning, illitic stoneware with particulate and soluble salt impurities | 
| Materials | 3C White Ball Clay Lignitic, white burning refractory ball clay | 
| Materials | 3D Clay Fine particled, clean, silty stoneware clay containing natural feldspar | 
| 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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