Question

potter used to dig clay
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Answer 1

It may not work for stoneware, but most common clays are fine for earthenware. Most of it will fire to cone 05 without problems. GOOD USES OF IMPURE CLAY - Potters who make high fire stoneware sometimes add small amounts of impure local clay to their clay body to add character and blemishes.

I didn't understand question but I guess this is answer