Tarnish

Tarnish is a layer of corrosion that develops over copper,

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brass, silver, or aluminum as they undergo oxidation.

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Corrosion: Corrosion is deterioration of useful properties in a material due to reactions with its environment. Weakening of steel due to oxidation of the iron atoms is a well-known example of electrochemical corrosion. This type of damage usually affects metallic materials, and typically produces oxide(s) a...

Copper: Copper is a chemical element in the periodic table that has the symbol Cu and atomic number 29....

Brass: Brass is an alloy of copper and zinc, a solid-solid solution. Typically it is more than 50 % copper. Some types of brass are called bronzes, despite their high zinc content....