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Feldspar 40
Flint 20
Kaolin 15
Ball clay 5
Sodium Bicarbonate 6
Soda Ash 6
Whiting 5
Fine Wnite Sand 8
Fire to cone 08
Add Bentonite to increase plasticity
About 3% Cobalt Oxide will give a strong blue
Copper Oxide 3-6% will produce turquiose.
Bill R.
Souhegan HS