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Gerstley Borate

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Gerstley Borate

Often used interchangeably with colemanite which is no longer available. A low temperature flux which helps to prevent crazing in glazes and acts somewhat as an opacifier. Often gives an opalescent quality and can give a mottled surface. Can be used as a substitute for calcium in glazes where a pink or red tint is desired or where calcium would harm colors. 

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