Discussion
Consider the following statements about the named clays.
1. China clay is chiefly kaolinite and fires white.
2. Ball clay is finer and more plastic than china clay.
3. Fireclay is chosen for its whiteness after firing.
Answer: C
The first two are correct. The third names the wrong property, since fireclay is valued for refractoriness and is generally too impure to fire white. Alumina content rather than colour is what a refractory clay is bought for.
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