Grog (clay)
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Grog (also called firesand or chamotte) is a type of pre-fired clay that has been ground and screened to a specific particle size.
Grog is used in pottery and sculpture to add a gritty, rustic texture called "tooth"; it also reduces shrinkage and aids even drying. It also adds structural strength to hand-built and thrown pottery during shaping although it can diminish fired strength.
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