what type of coating is formed on silver and copper articles when they get corroded
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A black coating of silver sulphide is formed on silver articles when they get corroded. The silver articles react with Hydrogen Sulphide (H2S) present in air to form a black layer on it.
When copper articles are left exposed to air, they react with oxygen, water and carbon dioxide to form copper carbonate.
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A black coating is formed on silver and copper particles when they get corroded ....
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