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<p>[QUOTE=&quot;imrich, post: 2550507, member: 22331&quot;]Thanks Doug, I already had that when I responded to the comment about the melting of plastics, and asked about the Fluoroelastomeric &quot;plastics&quot; such as in the far right column of the chart (i.e. Polytetrafluoroethylene).</p><p><br /></p><p>Once the plastic was extruded into the coin crevices, and welded in place, surface processes, unless impinged with appropriate solvents, are virtually useless.</p><p><br /></p><p>I have a proprietary generally harmless (i.e. when patiently/attentively applied) process developed for generally cleaning coin crevices and surfaces without altering luster. The process works best with non-oxidizing &quot;noble metals&quot; as Gold.</p><p><br /></p><p>Your input, as always with useful information, is appreciated.</p><p><br /></p><p>Respectfully, Rich[/QUOTE]</p><p><br /></p>

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