silver articles turn black and copper items turn green after sometimes
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Because silver articles react with hydrogen sulphide gas present in air and a thin layer of silver sulphide form due to which silver articles turn black.
Copper items turn green. because copper react with carbon dioxide due to which a green coloured coating of basic copper carbonate form.
Copper items turn green. because copper react with carbon dioxide due to which a green coloured coating of basic copper carbonate form.
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Silver articles turn black when they react left exposed to moist air because Ag2S (silver sulphide) is formed on silver.
Copper items turn green because CuCO3.Cu(OH)2 (basic copper carbonate) is formed on copper.
May this answer help you.
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