Question

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Answer 1

Answer: Sour substances should not be kept in copper vessels. Curd contains lactic acid which reacts with the copper vessel. As a result it makes the curd or sour substances toxic i.e. harmful for health. So curd or sour substances should not be kept in the copper vessels.

Answer 2

Sour substances like curd should not be kept in brass or copper vessels .
Sour substances contain acid like curd contains lactic acid and this acid may react with the vessels made of copper and brass and this can lead to the formation of a substance that is not good for our health .
So we should not store curd and other sour substances in vessels made brass or copper