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Why do coins turn gray

Posted: Tue Jan 07, 2020 6:45 pm
by Andrew1963imp
What causes a coin to do this it os gray in middle on back have couple coins like this ... ??

Re: Why do coins turn gray

Posted: Tue Jan 07, 2020 8:20 pm
by Daniel
It's toning from reacting with it's environment.

Re: Why do coins turn gray

Posted: Tue Jan 07, 2020 10:03 pm
by Paul
:agree: