A closeup of 35-48 mesh grog particles (courtesy of Plainsman Clays). Grogs are added to clay bodies to impart better drying properties. Grog particles perform their drying-shrinkage-reducing function (for plastic bodies) best when they have an angular rather than round shape.
Grog is a term used in ceramics to describe crushed brick (or other fired ceramic) aggregate that is added to sculpture and structural clays to improve drying properties.
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