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<p>[QUOTE=&quot;GDJMSP, post: 2668952, member: 112&quot;]I&#039;m reasonably certain that&#039;s not a carbon spot, but yeah, that&#039;s what most people call spots like that.</p><p><br /></p><p>Look at the very center of the black spot, see that little dot there ? Well I&#039;d be willing to bet ya that little dot was at one time a tiny piece of foreign material (organic) that somehow got onto the coin. And during the decay of that tiny piece of foreign material it caused the black toning that you see around it. </p><p><br /></p><p>Now could you remove that black ? Yeah sure, but when you did you&#039;d be left with a light colored spot the same size or maybe a little bigger. And it would stand out and be almost as unsightly as the black one.</p><p><br /></p><p>So your best bet is to just replace the coin.</p><p><br /></p><p>The lesson here is two fold I guess. One, that is usually best to just replace coins that have spots because even if removed there&#039;s still going to be spots of a different color - unless you treat the whole coin - as in dipping it.</p><p><br /></p><p>The second lesson is that when you see spots that have a tiny little spot at the center of a different color, usually lighter in shade, it&#039;s a pretty safe bet the spot was caused by organic material of some kind. And it can be almost anything up to and including saliva droplets, which are often the most common cause. </p><p><br /></p><p>Carbon spots, real carbon spots, are going to be tiny, tiny little black spots, solid in color. And they are going to be embedded into the metal. And they don&#039;t ever increase in size. As opposed to being &quot;on&quot; the metal as foreign material always is, and which does increase in size leaving a lighter colored spot in the center.[/QUOTE]</p><p><br /></p>

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