Why do coins turn gray

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Andrew1963imp
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Why do coins turn gray

#1 Unread post by Andrew1963imp »

What causes a coin to do this it os gray in middle on back have couple coins like this ... ??
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Daniel
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Re: Why do coins turn gray

#2 Unread post by Daniel »

It's toning from reacting with it's environment.

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Re: Why do coins turn gray

#3 Unread post by Paul »

:agree:
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