why do silver articles become black after some time?

Silver articles, when exposed to air become black after sometime. This is because the silver metal reacts with sulphur present in the atmosphere and forms silver sulphide. Thus, a layer of silver sulphide is formed on the surface of silver articles, because of which they appear dull and black. 

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 Silver metals develop a black layer of silver sulphide when kept for long time in atmosphere by reacting with hydrogen sulphide present in the atmosphere. This is a kind of corrosion of silver metal.


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