Question

why should curd and sour substances not be kept in Brad and Copper vessels? ​

Answer 1

Because they corrode them as they are acidic in nature

Thanks

Answer 2

curd and sour substances are mainly acidic in nature and copper and brass are metal

so when acid reacts with metals the form salts and salts are not always edible some are poisoning too so we should take precautions of not storing sour substances in copper or brass vessels