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<p>[QUOTE=&quot;Oldhoopster, post: 3027147, member: 84179&quot;]A <u>quick soak and thorough rinse</u> in pure acetone (not nail polish remover) will remove a lot of (not all) organic based junk that adheres to the coin.&nbsp; It does not react with any metal or toning.&nbsp; In some cases, if the spot was on the coin for a long period of time, the rest of the coin may have toned, but the area under the spot may still be the original color, or the material may have corroded/reacted with the metal.&nbsp; This would cause it to have a different color</p><p><br /></p><p>As others have said, your coin has paint, nail polish, or maybe even solder (which wouldn&#039;t be removed with acetone).&nbsp; It is not a mint error.&nbsp; I wouldn&#039;t bother with trying to remove it, unless you&#039;re really curious.&nbsp; IMO, you&#039;re not gaining anything, it&#039;s probably more trouble than it&#039;s worth.[/QUOTE]</p><p><br /></p>

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