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<p>[QUOTE=&quot;desertgem, post: 2206761, member: 15199&quot;]Not in my experimentation, and the original formulation is for organic material so I would not expect it to be effective. Carbon spots are&nbsp; from a reaction with the coin metal, and gases in the air intensified by moisture. Why often sneeze saliva particles form a scattered pattern. Dips ( acid) tend to work on silver coins for this, but as the spots may be deeper than thought, you might destroy any luster with a dip. Copper with such spots, I just leave them alone.[/QUOTE]</p><p><br /></p>

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