Discussion in 'Coin Chat' started by Mary Neely, Dec 7, 2018.
I have a red 1970 Penny. What causes this?
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Just one of the colors copper will turn. There is no way to know what caused that color.
Copper is reactive. Air, water, soil, gases, pollutants will turn it colors.
If it has been in the ground, it will often turn red.
Normal coin. Color is affected by environmental exposure.
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