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Tarnish
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==Chemistry== Tarnish is a product of a [[chemical reaction]] between a [[metal]] and a [[Nonmetal (chemistry)|nonmetal]] [[chemical compound|compound]], especially [[oxygen]] and [[sulfur dioxide]]. It is usually a metal [[oxide]], the product of [[oxidation]]; sometimes it is a metal sulfide. The metal oxide sometimes reacts with water to make the hydroxide, or with carbon dioxide to make the carbonate. It is a chemical change. There are various methods to prevent metals from tarnishing.
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