what is tarnishing?
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Tarnish is a thin layer of corrosion that forms over copper, brass, aluminum, magnesium, neodymium and other similar metals as their outermost layer undergoes a chemical reaction. ... It often appears as a dull, gray or black film or coating over metal. Tarnish is a surface phenomenon that is self-limiting, unlike rust.
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Step-by-step explanation:
Tarnishing is a way in which some metals change colour when exposed to the air.
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