266G Umbria w/ Grog

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*