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The original Gerstley Borate has been discontinued. Laguna has created a Gerstley Borate Blend which is a close substitute for the original. You can also us Gillespie Borate as a substitute.
Gerstley Borate – (Na20 2Ca0 5B203 16 H20) A sodium, calcium borate unprocessed ore used as a low temperature flux in clay formulas.
