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0.35% barium added to the one of the left makes the amazing difference on the bases of these two stoneware mugs. The slightly soluble barium precipitates the soluble sulphates in the body, leaving them insoluble within the matrix. Notice that not only has the brown glassy scum at the edges been removed but the whole body surface is actually less vitreous.
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. |
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