Question

why pickles and sour substances are not stored in brass and copper vessels?

Answer 1

because if they are stored in metals they canspoil them or make them rusted
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Answer 2

pickles and sour substances are not stored in copper and brass vessels because the metals can react with the acids present in sour substances and pickles and this will/could lead to spoiling of sour substances or pickles
Hope it helps .....