Question

why are all food articles preferably packed in aluminium foils?​

Answer 1

because it don't react with salt and other chemicals

Answer 2

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Aluminium foils do not corrode in atmosphere even if kept for a long time. Actually, a protective coating of aluminium oxide is form on the surface of the foil. It stops any for the reaction of the metal with air and water. The food articles do not get spoiled.