A pliable clay with smooth grog and color from manganese and iron. Fires almost black when in oxidation. It is not recommended to fire this clay in reduction.
Characteristics
Cone: 5
Wet Color: Red/Brown
Firing Color: Oxidation: Brown/Black – Reduction:Black
Texture: Slightly Coarse
Penetrometer Target: 6.75
Avg. Shrinkage 2±%: 10%
Avg. Water Absorption 1±%: 3%
COE x 10-6: 7.275