266G Umbria w/Grog ^4-6C 4 6 Gives a reduction like dark brown color in an electric kiln. Smooth and plastic. Contains manganese and a small amount of fine grog is added. It's good for all techniques. We recommend firing to cone 5. Cone 4 Average Shrinkage 11. 0% Absorption 2. 4% Cone 6 Average Shrinkage 11. 5% Absorption 1. 0%
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