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<p>[QUOTE=&quot;adric22, post: 1541032, member: 38146&quot;]I had one like that the other day.&nbsp; It was so black you could hardly tell what it was.&nbsp; I did a two stage cleaning on it.&nbsp; I let it sit in hydrochloric acid for about 6 hours.&nbsp; (mix salt+vinegar) and then scrubbed with tooth brush and baking soda for several minutes.&nbsp; That fascinating thing about this particular one is when it was done it actually looked better than most of my half-dollars.&nbsp; Obviously it was shiny and new looking but it actually had fewer scratches on it than most of my other circulated coins and thus looked even better.&nbsp; But when it was black, I couldn&#039;t tell that about it.&nbsp; I have to wonder what happens to coins to make them turn black like that.[/QUOTE]</p><p><br /></p>

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