Curd and sour substances should not be kept in brass and copper vessels because they contain acids, such as lactic acid in curd and other organic acids in sour substances. These acids react chemically with brass and copper, which are metals, leading to the formation of poisonous or toxic compounds that can be harmful if consumed. Additionally, this reaction can cause the corrosion of the vessels themselves. Therefore, storing curd and sour substances in such metal containers is unsafe for health and can result in food poisoning due to the toxic salts formed.
Besides this, curd provides many health benefits including improving digestion, boosting immunity, and aiding skin health, making it a valuable part of the diet, but it should be stored properly to avoid harmful chemical reactions.
