pickles or any other sour substances consists of acids which react with copper or brass vessels to liberate Hydrogen gas and form soluble salts. These salts are poisonous to animal life 
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Pickle is sour and if it's kept in copper vessel it turns into poision or rots we should always store sour foods like pickles in a vessel with tin inside or glass vessel to keep it good .
plz mark it as the brainliest
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