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<p>[QUOTE=&quot;The Eidolon, post: 7859337, member: 102103&quot;]Do you know what might be stuck to them?&nbsp; Any oxidation or metal softening is probably permanent.&nbsp; Surface organics may be removable, but they may be hardened enough to be difficult to remove with a plain solvent soak.&nbsp; You might try the worst one and experiment on that one and see if the progress is enough to be worth continuing. I suspect you could get off some of the surface coating, but that it would still look pretty mottled and ugly due to permanent surface damage.</p><p><br /></p><p>We used to use sonication + solvent baths to remove difficult organic deposits in chem lab, but sonication is very rough on soft metals and will cause cavitation and loss of metal in the form of shedding metal dust, so I wouldn&#039;t try it on coins.</p><p><br /></p><p><br /></p><p>Good luck, and sorry for your friend&#039;s loss.[/QUOTE]</p><p><br /></p>

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