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What do you do to prevent rusting of cop...

What do you do to prevent rusting of copper and silver articles ?

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I can follow some methods which are given below to prevent rusting of copper and silver articles.
1) Shielding the metal surface from oxygen and moisture.
2) By painting.
3) By oiling, greasing.
4) By galvanizing, chrome plating.
5) By making alloys.
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