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<p>[QUOTE=&quot;Cherd, post: 3047551, member: 24754&quot;]I have a PhD in environmental engineering. I&#039;ve had enough chemistry to have a working knowledge of the basic types of chemical reactions, and I know that the metals used in coinage do not participate in all of them.</p><p><br /></p><p>In particular, I build numerical models of contaminant transport in groundwater. Many of these contaminants are metals, and I have to characterize the reaction kinetics that affect transport properties. These reactions take place in a different type of environment, but they are still effectively the same thing.</p><p><br /></p><p><br /></p><p><br /></p><p>If this is your definition of &quot;cleaned&quot;, then your point is valid. But, this is like saying, &quot;If you can&#039;t tell that the coin is a forgery, then it&#039;s not a forgery&quot;. So, you should just pay really good counterfeiters to make your coins, right?</p><p><br /></p><p>It may be impossible to tell if a coin has been cleaned, but if you paid to have it cleaned, then you know that it is, in fact, cleaned. If the aversion to cleaning is that the original surface has been altered, then it&#039;s hypocritical to dismiss this fact in the case that it&#039;s not apparent by looking at it.[/QUOTE]</p><p><br /></p>

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