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Why do silver articles become black on prolonged exposure to air?

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asked Jan 16, 2018 in Science by sforrest072 (157,439 points) ● 60 ● 409 ● 932
Why do silver articles become black on prolonged exposure to air?

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answered Jan 16, 2018 by faiz (82,347 points) ● 6 ● 6 ● 11
selected Jan 25, 2018 by Vikash Kumar
 
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Sulphur compounds such as hydrogen sulphide gas (H2S) present in the air when combine with the silver articles form a black coating of silver sulphide (Ag2S).

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