Question

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

Answer 1

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.

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Answer 2

okaY

simple Logic..

-Metal +Acid =Harmful Product

As U know Copper Is -Metal It rxts with -Metal And Produces Harmful products ..

Hence Curd has not been kept I'm copper