Lead Bisilicate fritting involves the melting together of glaze materials (some of which are soluble in water or stomach acids) to produce a combination which is insoluble (or relatively so).
Lead bisilicate is the frit generally used in low solubility glazes and standard borax frit for leadless glazes.
Firing range 880∞C -1050∞C
PbO = 65.04
Al2O3 = 2.55
SiO2 = 32.40
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