Ingredient Amount
Gerstley Borate 55.00
EPK Kaolin 30.00
Silica 15.00
Add Amount
Cobalt Carbonate 2.00
Copper Carbonate 2.00


This recipe was originally published in the January/February 2018 issue of Pottery Making Illustrated.
The recipe above will produce a blue glaze. For a clear glaze, omit the Cobalt Carbonate and the Copper Oxide.

Since this recipe contains a high percentage of Gerstley borate, it is best to mix small batches that you will use relatively quickly, as the glaze will gel over time.