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Silver reacts chemically with sulfur to produce the compound silver sulfide, which is commonly known as silver tarnish. Felt, wool, rubber bands, eggs and onions are some of the many foods and materials that have sulfur available for the reaction. This is natural and will affect anything made of silver, including a silver locket.
Source:
Home Experiments: Put A Shine On It
Silver: Tarnish, Care and Cleaning
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