That to me looks like the coin has been exposed to some heat. I have seen some crazy rainbow toned pennies that can be easily done exposing the coin to an open flame. Just before the colors come, they usually go gold in color.
so in other words someone did this? if yes how ? AZMAT you had me burning pennies half hour ago to see if I can get the same result all of them turned pink or blue or both none golden tho.
I assume that works only with the plated cents, because of the zinc interacting with the copper in the frying pan's heat -- it would be scary to think of what older coins could be turned to brass by heat alone...
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