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<p>[QUOTE=&quot;desertgem, post: 2895515, member: 15199&quot;]It is not quite that simple. Since you seem to have some chemistry, I would recommend searching out &#039;metallic bonding&#039; which is the concern here, rather than covalent bonding (molecule). The bonding portion of the five cent piece to the contaminant is most likely copper rather than nickel ( 25%) as it is more reactive and also the higher component at 75%. I didn&#039;t suggest Ferric chloride at the time as you didn&#039;t want physical damage, pitting or discoloration which it would produce. FC is know coin wise as the agent in Nic-a-Date and can dissolve enough of the surface to make a worn date visible, but does leave staining and damage. It would probably remove the crud on the coin, but the surface would be ruined, so I suggested leaving as was, and that is what you are doing so&nbsp; that is good. Jim[/QUOTE]</p><p><br /></p>

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