Marianne Eshleman on sat 21 oct 06
I was wondering if anyone has the recipe for "Copper Grape" Glaze or have
you ever heard of it? What cone is it for? Thanks.
Marianne
John Britt on sat 21 oct 06
Marianne,
Here is a recipe that is a copper red glaze with cobalt carbonate to make
it purple.
GRAPE Cone 10 Reduction
Custer Feldspar 49.75
Whiting 7.99
Silica 24.87
Gerstley Borate 4.97
Barium Carbonate 4.97
Zinc Oxide 2.44
Dolomite 4.97
Tin Oxide 1.00
Copper Carbonate 2.00
Cobalt Carbonate 0.30
I have a bunch more in my book in the Purple chapter.
Hope it helps,
John Britt
www.johnbrittpottery.com
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