Why Do Pennies Turn Green?

Answer

Pennies turn green when their copper content interacts with elements in their environment, including the carbon dioxide in the air. Copper and carbon dioxide combine to form a compound called copper carbonate and this greenish substance is often called verdigris.
Q&A Related to "Why Do Pennies Turn Green"
The penny has copper in it. Copper reacts to the oxygen in the air by producing copper oxide therefore turning green. The older the coin, the more copper in the coin.
http://wiki.answers.com/Q/Why_does_a_penny_turn_gr...
Garlic turns green when it is not ripe and is exposed to sunlight or heat. This is common also with vinegar, lemon juice, onions and other acidic foods.
http://www.ask.com/web-answers/Food_and_Drinks/Foo...
The light spectrum, a part of the electromagnetic spectrum, is composed of red, orange, yellow, green, blue, indigo and violet. Red and blue light are the most important for plant
http://www.ehow.com/facts_8388518_do-plants-turn-g...
Copper oxide (CuO) which is always present on copper surface reacts with acetic acid (the solution of which is vinegar) and forms green copper (II) acetate: CuO + 2CH3COOH = Cu(CH3COO
http://answers.yahoo.com/question/index?qid=200711...
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