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Low temperature clays are far more likely to have this issue. And if present, it is more likely to be unsightly. The salt-free specimens have 0.35% added barium carbonate.
| Materials | 
Barium Carbonate
 A pure source of BaO for ceramic glazes. This is 77% BaO and has an LOI of 23% (lost at CO2 on firing).  | 
| Hazards | 
Barium Carbonate in Clay Bodies
 Considerations regarding the use of barium carbonate in pottery and structural clay bodies for precipitation of soluble salts.  | 
| Articles | 
The Majolica Earthenware Process
 How to make strong, durable functional ware from red terra cotta odies based on the traditional of majolica.  | 
| 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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