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The concentrations are not serious and are typical of what you might find on a commercial body.
| Glossary | 
Sulfates
 Soluble sulfates in clay produce efflorescence, an unsightly scum that mars the fired surface of structural and functional ceramic products.  | 
| Glossary | 
Soluble Salts
 In ceramics, certain compounds in clays and glazes can dissolve into the water, then on drying these are left on the surface.  | 
| 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.  | 
| Tests | 
Soluble Salts
 Evaluate and compare the solubles salts content in clay bodies and materials  | 
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