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<p>[QUOTE=&quot;NSP, post: 2785742, member: 74849&quot;]While it seems like a workable idea at first glance, it would be very difficult to get useful results (and pretty much impossible to do without hurting the coin). As others have said, any oxide or sulfide film will greatly impede the flow of electrons. </p><p><br /></p><p>I got to experience this first hand with an engineering class project last fall by comparing the current that would flow through a sample of freshly polished lead foil vs. lead foil that had a lead phosphate film on it. The sample with the lead phosphate film had a significantly smaller current (~40% less after IIRC giving the phosphate film 24 hours to form). I assume that a coin that&#039;s been developing a sulfide or oxide layer for years would similarly resist an electric current.[/QUOTE]</p><p><br /></p>

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