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<p>[QUOTE=&quot;Insider, post: 3047575, member: 24314&quot;]&quot;Cherd, posted: &quot;I have a PhD in environmental engineer. 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.&quot;</p><p><br /></p><p><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" />&nbsp; Not only do I claim to be able to tell if a coin is not original, I can also tell a PhD when I read a post from one.&nbsp; I&#039;ll look forward to reading more of your opinions about coins!&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /></p><p><br /></p><p><span style="color: rgb(255, 0, 0)"><span style="color: rgb(255, 153, 153)"><span style="color: rgb(0, 0, 0)">Cherd continued: </span><b><span style="color: rgb(255, 77, 77)">:If this is your definition of &quot;cleaned&quot;,</span></b></span><b> <i><span style="color: rgb(179, 0, 0)">then your point is valid.</span></i></b></span> 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>NOW you have caught on!&nbsp; You have proved to be well educated <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie26" alt=":bookworm:" unselectable="on" unselectable="on" /> and I especially like the way you provided another example to make the point that you truly understand!</p><p><br /></p><p>Cherd contends that: 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.&quot;</p><p><br /></p><p>If I remove something from a coin it may not affect the underlying original surface.&nbsp; Did I clean it - <span style="color: rgb(0, 102, 0)"><b>YES</b></span>.&nbsp; Can anyone who didn&#039;t see the coin before I got it tell that I changed it - <b><span style="color: rgb(179, 0, 0)">NO</span></b>!&nbsp; You see, this topic can go on, and on, and on with everyone adding opinions and gossip that does not really matter in the real world.</p><p>If you are really interested in cleaning coins, do a lot of reading, go find a mentor/teacher (much faster), and then play around with some junk until you get good at it.</p><p><br /></p><p>BTW, Cherd made this comparison:&nbsp; &quot;...But, we are not talking about brain surgery here. Aside from the minority of cases where action is taken to preserve a coin that would further degrade for some reason, <b>we are talking about making <b>small, metal disks </b>more aesthetically pleasing.</b> What we are talking about is less like dentistry, and more like mopping the floor at the dentist&#039;s office.&quot;</p><p><br /></p><p>BTW, many of those <b>small, metal disks </b><span style="color: #660066">are worth more than the dentist office and the dentist&#039;s education combined</span><b>.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie85" alt=":smuggrin:" unselectable="on" unselectable="on" /> </b>[/QUOTE]</p><p><br /></p>

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