Not one red cent.

I found a few wheat cents from the 50's that have turned red.

They have not been painted, but it looks as if they turned that way over time.

What would cause such a thing?

 

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pictures, please.

 

You really think that is possible?

 

Too much time in the sun without proper protection? Lincoln cents need at least SPF 15 or higher.

 

Accumulative layers of cuprite will turn a copper coin red. It's one step away from turning black and corroding away.
Guy