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Precipitated crystals from a glaze having 60% lead bisilicate frit

It also contains less than 10% borax frit and some Cornwall stone.

Precipitated crystals from a glaze having 60% lead bisilicate frit

Related Pictures

Are frits partially soluble? Yes, many are.

These 1 mm-sized crystals were found precipitated in a couple of gallons of glaze containing 85% Ferro Frit 3195 (we have seen these with frit 3249 also). They are cubical, hard and insoluble. Why and how to do they form? Many frits are slightly soluble, the degree to which they are is related to the length of time the glaze is in storage, the temperature, the electrolytes and solubles in the water, interactions with other material particles present and the diligence of the manufacturer in mixing, correctly achieving the target chemistry and firing. The solutes interact or saturate to form insoluble species that crystallize and precipitate out as you see here. These crystals can be a wide range of shapes and sizes and come from leaded and unleaded frits. In industry this issue is not generally a problem because glazes are used soon after being made.

Links

Glossary Precipitation
Crystals or crystalline particles will often form over time in ceramic glaze slurries that contain slightly soluble materials.
URLs https://en.wikipedia.org/wiki/Ooid
Ooids in Glazes

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