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532 Sky Blue
Velvets fire true-to-color as a Cone 05/06 underglaze or fired to Cone 6
UG-87 Regal Purple
clay becomes hot
Gerstley Borate Stoneware Gloss 532 Sky BlueGerstley Borate is a sodium calcium borate compound used in ceramics as a low and mid range temperature flux. It is essentially a source of boron in glazes, and acts as a melting agent. It also can act somewhat as an opacifier and prevent crazing.
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