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All about Gerstley Borate substitutes
IMCO information on their mined clays
Materials that source Na2O, K2O, Li2O, CaO, MgO and other fluxes but are not feldspars or frits. Remember that materials can be flux sources but also perform many other roles. For example, talc is a flux in high temperature glazes, but a matting agent in low temperatures ones. It can also be a flux, a filler and an expansion increaser in bodies.
Gerstley Borate Substitutes
Be careful, many of these materials are approximate substitutes (e.g. they have similar chemistry but much different physical properties). There is no exact substitute.