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"
A penny only turn green if it is originally copper. Copper turns green when in water for to long of a period. The current pennies are not made of copper.
http://www.ask.com/web-answers/Science/Chemistry/w...
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...
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...
This is most commonly because of a chemical reaction between the acids in your skin combined with the metal of the ring. The most common types of metal that cause this reaction are
http://www.quora.com/Rings/Why-do-rings-turn-your-...
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