Question

why should curd and sour subtances should not be kept in brass and copper vessels​

Answer 1

acids are sour.acids also react with metals, which destroys the taste of food.so,food is stored in plastic containers

Answer 2

Answer:

when kept in copper or brass vessels,curd(and other acidic food items) reacts with copper and forms toxic compounds which may be unfit for human consumption,and may cause food poisoning. thus it is not advisable to keep curd and other acidic or sour food items in copper or brass vessels.