Why should curd and sour substances not be kept in brass and copper vessels?
- Brass and copper are metals.
- Curd and other sour substances contain lactic acid (C 3 H 6 O 3 ).
- When metals react with acids , they produce salt and hydrogen gas .
- When sour substances like curd are kept in brass or copper vessels , the lactic acid in curd reacts with the metals which leads to the corrosion of the vessels as well as the formation of harmful salts that cannot be consumed.