Ingredients

Ingredient Amount
Custer Feldspar 41.90
Silica 26.20
Dolomite 8.70
Ferro Frit 3134 8.70
Whiting 8.40
Barium Carbonate 4.40
Zinc Oxide 1.70
Add Amount
Tin Oxide 2.60
Bentonite 1.00
Copper Carbonate 0.50

Instructions

Published in "Copper Oxide" by John Britt, in the Jun/Jul/Aug 2012 issue of Ceramics Monthly.