Polished And Tarnished Silver Spoons
by Science Photo Library
Title
Polished And Tarnished Silver Spoons
Artist
Science Photo Library
Medium
Photograph - Photograph
Description
Silver tarnish. A pair of spoons, one recently polished and the other with a dark tarnish. The tarnish is a layer of silver sulphide, formed by a reaction with oxygen and trace amounts of hydrogen sulphide in the air. The reaction is describe by the equation 4Ag + O2 + 2H2S = 2Ag2S + 2H2O. Once a thin layer of tarnish forms it blocks further hydrogen sulphide reaching the silver below, thus tarnish is a self-limiting process. Tarnish can be removed electrochemically, but is normally removed by polishing with a very fine abrasive.
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August 5th, 2016
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