Discussion
Assertion (A): Onglaze decoration offers a wider colour range than underglaze but wears more readily.
Reason (R): It is fired at a lower temperature and sits on top of the glaze rather than beneath it.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason accounts for both halves. The lower firing temperature lets pigments survive that would burn out or dissolve at glaze temperature, which is why onglaze offers reds, pinks and bright yellows underglaze cannot. But the decoration sits on the glaze rather than sealed beneath it, so it is exposed to cutlery, abrasion and dishwashing and wears away in time.
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