Why should curd and sour substances not be kept in brass and copper vessels ?
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Curd and sour substances should not be kept in brass and copper vessels because these and other sour food-stuffs contain acids which can react with the metal of the vessel to form poisonous metal compounds which can cause food poisoning and affect our health adversely.
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Lactic acid develops in cow milk because of breaking down of bacteria. ... Hence when these acids react with metals they give salt and hydrogen. If these kinds of substances which possess acids are kept in copper containers or vessels they will react and produce salt and hydrogen and the vessel will be corroded.
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