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<p>[QUOTE=&quot;jody526, post: 25284, member: 578&quot;]Tough question. </p><p>I began collecting coins as a child, and did a lot of experimenting. I learned to recognize cleaned coins, by cleaning them.</p><p>Also learned to recognize toned coins, by toning them.</p><p><br /></p><p><a href="http://www.pcgs.com/articles/article2316.chtml" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.pcgs.com/articles/article2316.chtml" rel="nofollow">This article</a> is pretty good, but no amount of reading can ever be as good as first-hand knowledge.</p><p>There is just no better way to learn, than to place a known cleaned coin beside a known uncleaned coin, and observing the difference.</p><p><br /></p><p>Of course, it should always be restated that a coin that has numismatic value should not be cleaned.</p><p><br /></p><p>I believe the A.N.A. offers correspondence courses on this, and other subjects. Don&#039;t know how good they are, or if they are worth the price, but it may be something worth looking in to.[/QUOTE]</p><p><br /></p>

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