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Grog added to a ceramic body is

  • A.a naturally occurring highly plastic clay
  • B.a chemical flux that lowers the melting point
  • C.an organic binder that is burnt out during firing
  • D.pre-fired ceramic crushed and returned to the mix

Answer: D

Having already been fired it does not shrink further, so it reduces the overall drying and firing shrinkage of the body. Refractories and heavy clay ware use it extensively for exactly that reason. Grog also opens the body and helps water escape during drying.

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