Chemistry
US Coins

What rusts a penny?

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2014-04-23 00:40:26
2014-04-23 00:40:26

Pennies are made of zinc plated with copper. Copper reacts with oxygen and water to form copper oxide. This is the tarnish you see on pennies that have been in damp conditions. The only U.S. coins that can truly rust are the 1943 zinc coated steel cents.

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Related Questions



Pennies are made of copper and zinc, which don't rust.


the Statue of Liberty is green because it has been there for a long time. Since metal rusts, the Statue of Liberty also rusted. In fact, it rusted enough for it to turn green. If a penny rusts enough, it will also turn green.


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