Ingredient Amount
Gerstley Borate 12.50
Whiting 6.25
Custer Feldspar 77.00
EPK Kaolin 4.25
Add Amount
Red Iron Oxide 7.50
Bentonite 1.00


This recipe was shared in the January 2019 issue of Ceramics Monthly by Adrian King.
Apply a medium thickness to show slips through the glaze. A heavier reduction atmosphere results in a more red/black glaze. A more oxidized atmosphere produces a yellow/black glaze. I soda fire this glaze to cone 10–11 reduction in a gas-fired kiln.