American cents are made of copper-plated zinc. This is a cent that, by one means or another, has lost it's copper plating and is now just pure zinc. The "dirt" is zinc corrosion.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
That is one of the science experiments that some one added zinc to cover the copper plating. If this were an un-plated planchet, the surface would be smooth, not rough looking like this example.
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