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Sourness of food is due to the presence of organic acids .If it is stored in metal containers without proper wrapping in food grade plastic bags,the acid present in the food may react with the metal and corrode the container.Due to this reaction colour ,flavour and taste of the food will change and make the food unacceptable for consumption.
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Because they will react with aluminium and the jar will start corroding
if u store sour food it will become unfit for consumption
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