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<p>[QUOTE=&quot;SuperDave, post: 2354604, member: 1892&quot;]I&#039;m gonna to use this one for a teaching moment.</p><p><br /></p><p>The surface of a coin under dirt/crud patinates at a different rate than the exposed surfaces, if at all. Gold as a noble metal is less susceptible to corrosion than others, but the point stands that if you remove the dirt, the underlying surfaces will be of a different patination than the rest and the coin will clearly look cleaned. You&#039;ll then have to also remove the patination to regularize the surfaces, leaving a circulated coin <b>obviously</b> too &quot;clean&quot; looking to be original.[/QUOTE]</p><p><br /></p>

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