Gillespie Borate - Gerstley Borate Substitute Size:22.68 kg Model 222 & 222S -
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Gillespie Borate - Gerstley Borate Substitute Size:22.68 kg Model 222 & 222S -A very close substitute for Gerstley Borate that is close to extinction. Gillespie Borate is a naturally occurring source of boric oxide, promoting early fusion in glazes. It's a blend of the same minerals proportioned to preserve the chemistry and working properties of Gerstley Borate. Use it as a direct 1: 1 substitute. Testing in your glazes when substituting for Gerstley Borate is recommended as there are some subtle differences and impurities
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