Web tarnish on jewelry is caused when the metal reacts with sulfur, a chemical found in the air, wool, and foods such as onions and eggs. Tarnish is caused by a number of chemical reactions, and it takes little in the way of exposure to get the process started. Some of the chemicals that cause tarnish include:
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Tarnish may also occur if you forget.
Oxygen it was long thought that oxygen was the major cause for.
