Why do silver articles become black after a certain period of time ........

Science (CSC) Chemistry

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Why do silver articles become black after a certain period of time?

Silver reacts with Carbon Dioxide in the air and loses its shiny surface.

Silver reacts with Sulphur to form a coating of Silver Sulphide

Silver reacts with moisture in atmosphere and turns slowly from brownish to black colour.

Silver reacts with atmospheric oxygen to form the oxide of Silver.

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Explanation:

o Silver articles turn black after a certain period of time as it reacts with Sulphur to form a coating of Silver Sulphide. Some foods or everyday items containing sulfur can cause tarnishing. However, the polluted air can also turn sterling silver black.