Question

Why should curd and sour substances not kept in brass and copper vessels?

Answer 1

Answer:

as acids present in curd will react with them and form harmful toxic substances which is unfit for health

Answer 2

$<i> Curd and other sour substances contain acids. Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful products, thereby spoiling the food.$