Gillespie Borate

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Gillespie Borate is a blended borate material designed for use in glazes to replace Gerstley Borate. It has been on the market for over 20 years. A substitute for mined-out Gerstle y borate, a naturally occurring source of boric oxide, promoting early fusion. It is a blend of the same minerals proportioned to preserve the chemistry and working properties of Gerstley Borate. Use it as a 1:1 substitute. Testing first to compare fired results is recommended; some glazes may need minor adjustments. Show more