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<p>[QUOTE=&quot;Collect89, post: 1692814, member: 15445&quot;]You can search-out many interesting threads at CoinTalk.&nbsp; Search for words like AT, NT, artificially toned, Naturally toned, Questionably toned, etc.&nbsp; Also, there is a book called &quot;Coin Chemistry&quot; that is a good read.&nbsp; </p><p><br /></p><p>Copper is very reactive</p><p>Silver is reactive</p><p>Gold is not very reactive</p><p><br /></p><p>All coins begin toning as soon as they leave the coin press.</p><p><br /></p><p>Basically every coin has its own toning story.&nbsp; The coin I posted was affected by the atmosphere in a wet basement with a dirty furnace for many years.&nbsp; The reverse is bright white.[/QUOTE]</p><p><br /></p>

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