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<p>[QUOTE=&quot;GDJMSP, post: 1821141, member: 112&quot;]None that I have ever run across, at least none that explain it the way I explain it. I think I&#039;ve probably written more about it on this forum than you will find anywhere else. I started using that illustration many years ago when trying to explain luster, toning, and the interaction between the two in a way that was simple and easy to understand. In more recent years attendees at the classes held by the ANA report that the ANA instructors are using the same illustrations now in their classes. Whether they copied the idea from me, or came up with it on their own, that I cannot say.</p><p><br /></p><p>But my comments, simple illustrations, and explanations of the subject have caused or inspired other members of the forum to take highly magnified pictures of the luster on various coins. Those pictures plainly show the things I explain. The pictures also plainly show something else I have always tried to explain, that being that each different series of coins has its own unique type of luster.</p><p><br /></p><p>That said, Weimar White wrote a book about toning that focuses primarily on the chemistry involved. The information contained in the book regarding the chemistry is quite good and accurate. But, White is of the opinion that all toning is damage and that all coins should be dipped to remove that toning. </p><p><br /></p><p>As a whole, the numismatic community completely disagrees with White regarding that. Instead, they agree with what I write about, in this thread and others, that dipping should only be done when it <u>needs</u> to be done.</p><p><br /></p><p><br /></p><p><br /></p><p>That has also been discussed at length and many times. The only thing necessary to make it understandable is that if you are going to clean a coin, you have to know what you are doing in order to do it without damaging the coin. And simply put, most people don&#039;t.</p><p><br /></p><p>So, rather than try to explain it all, which takes a good bit of time, it has become a common mantra to say - don&#039;t clean your coins.</p><p><br /></p><p>In reality there is no contradiction - none. If you know how it is just as acceptable for a collector to properly clean his coins as it is for NGC, PCGS, or some other private party to do it. The key is knowing how.[/QUOTE]</p><p><br /></p>

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