Discussion
Ball clay differs from china clay chiefly in being
Answer: B
Correct answer: more plastic and less white when fired
Ball clay is a sedimentary deposit: transport sorted it to a finer particle size, which is what makes it plastic, and along the way it collected organic matter and iron, which is what makes it fire cream or buff. China clay is residual, sitting where it weathered, so it is coarser, less plastic and much purer.
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