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<p>[QUOTE=&quot;zaneman, post: 246410, member: 3970&quot;]There are several things that may have caused this. As bone mentioned, fire may cause this. Also, dipping a coin and not properly neutralizing it can cause black spots. Many other chemicals, particularly oxidizers can also turn a coin black. </p><p><br /></p><p>The coin on the right appears to be heavily corroded, and in my opinion there is most likely nothing you can do to improve it&#039;s appearance. As for the one on the left, I suspect the only thing that would remove the black spot would be dip, but I would recommend leaving it alone, as would quite possibly just make the appearance worse.[/QUOTE]</p><p><br /></p>

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