As stated - Copper plated zinc cents can acquire a "Rainbow tone" from either heat or laying in you cars coffee cup holder and getting splashed with sugar solutions from your coffees or soft drinks.
Normal toning for copper. I see why you kept it. Value is 1 cent, the coin has been circulated. That said, I have rolls of interesting toned Zincolns that I've saved because I like them. Collect what you think is cool!
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