Gillespie Borate - Gerstley Borate Substitute Size:22.68 kg The signature and most popular

The signature and most popular glaze of the Constellation Series

Thumb screw allows for the needle to be opened and secured

Model 222 & 222S - Total Number of Elements in Kiln: 8

Overall length: 21 1/2 inches

X2 12 mm U Fluting Tool

Gillespie Borate - Gerstley Borate Substitute Size:22.68 kg The signature and most popularA 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