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Gillespie Borate is a blended borate material designed for use in glazes to replace Gerstley Borate
low-ball clay porcelain for throwing and handbuilding
darkens significantly at cone 5
creating interesting brown streaks
Spectrum White 501 Underglaze Stoneware crystals Gillespie Borate is a blendedSpectrum's 500 Series Underglazes are all lead free, dinnerware safe, and A P non toxic when covered with a clear glaze. Underglazes can be used at almost any temperature range and can be applied to bisque or raw clay. Two to three coats are required for opaque, vibrant colours. The samples shown are at Cone 05, but these underglazes can be fired from low temperature (Cone 06 04) to high temperature (Cone 9 10). Some variation in colour will occur at
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