266G Umbria with Grog
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C/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%
*Image of clay is fired to cone 6*