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<p>[QUOTE=&quot;BadThad, post: 1067826, member: 17261&quot;]This is the natural toning progress that happens due to exposure to sulfide. It is not a residue left from the Mint. However, the spots on the reverse are some sort of carbon-based residue. My theory is that spots released the sulfide to tone the coin since it was a well-sealed and stored package. Of course, I moved it to an airtite some years ago...the pic is with the coin still in the airtite.[/QUOTE]</p><p><br /></p>

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