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<p>[QUOTE=&quot;daveydempsey, post: 315008, member: 22&quot;]Yes, it will make it look a bit more presentable and possibly prevent corrosion or staining of the coin.</p><p>Not knowing what the black stuff is, it could contaminate any coin holder or packaging you might store the coin in.</p><p>A light clean with ammonia will not harm the coin like an abrasive polish would,&nbsp; rinse in running water afterwards and pat dry with tissue.[/QUOTE]</p><p><br /></p>

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