Ingredients

Ingredient Amount
Barium Carbonate 48.00
Nepheline Syenite 48.00
frit 3289 or pemco frit 626 4.00
Add Amount
Bentonite 2.00
copper carb 6.00

Instructions

Very dry matt but smooth.  thickness strongly affects color.  Best results when thick and thin...shows a lot of variation.  LW recipe says purple where thin and aqua where thick.  I have found just the opposite.  From Ceramics Monthly, June 1995 and other published sources.
copper carb from 4 to 8 %