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These disks concentrate the solubles on the outer edge (because of the way they are dried). Soluble salts can enhance the visual appeal of a fired clay but they can also do the opposite.
| 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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