Question

why should curd or sour substance no be kept in copper or brass vessel

Answer 1

hola mate....

curd and sour substances can react with the surface of copper or braa vessel and thier consumption can be harmful so they should not be kept in brass or copper vessels

Answer 2

hey buddy

curd and sour substances are not kept in the copper and brass vessel because curd and sour substances contains lactic acid which reacts with them and forms corresponding salt which is harmful and toxic.