There is a coating that eventually will come on of the coin. It wears off the highest points first, the fields are last to remove the color. The color will change from brown to black in color, but eventually comes off looking very dull on the coin. Not a plus for the coin:
The color you have it is characteristic with acidic environment damages, like mentioned already. In my early reply I give the composition of the clad. This one react like this in time and acidic environment.
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