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<p>[QUOTE=&quot;-jeffB, post: 2248646, member: 27832&quot;]Induced current stays within the coin, and only arises when the coin moves through a magnetic field (or sits in a changing magnetic field). I think the only way it could affect toning is if it actually <i>heats</i> the coin, and that&#039;s not going to happen by accident.</p><p><br /></p><p>Induced <i>current</i> is different from electric <i>charge</i>, which I think is what you have in mind.</p><p><br /></p><p>Also, the stuff in the air that causes toning is mostly hydrogen sulfide or sulfur dioxide and moisture. Those don&#039;t really ionize until they&#039;re already on the coin&#039;s surface, at least not in normal atmospheric conditions. (You&#039;d need to subject them to high voltage and/or reduced pressure.)[/QUOTE]</p><p><br /></p>

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