Discussion
Assertion (A): Refractory and heavy clay bodies contain a large proportion of grog.
Reason (R): Pre-fired material shrinks no further and opens the body for water to escape.
Answer: A
Both are true and the reason gives both benefits: large or thick pieces are the hardest to dry and fire without cracking, and grog addresses the shrinkage and the permeability together. Grog content rises with the section thickness of the ware.
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