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<p>[QUOTE=&quot;USS656, post: 3244715, member: 6641&quot;]Doug, So without reading 12 pages of responses my definition of AT is the intentional act adding a chemical or heat to an environment where a coin is stored to cause toning.&nbsp; </p><p><br /></p><p>I have 5 1968 proof sets for the last 10 years or so.&nbsp; When I bought them I liked the way the nickels and quarters were starting to tone.&nbsp; I cracked the cases open but keep the shell together to give them some more air but did not change anything else about the storage method.&nbsp; Is this a subtle method of artificially affecting the toning?&nbsp; I don&#039;t think so but that&#039;s just me and others are welcome to disagree. It will probably take another 10 years to get to the point I pull them out of their set holders and place into airtites to stabilize/stop the toning process. </p><p><br /></p><p>[ATTACH=full]850200[/ATTACH] [ATTACH=full]850201[/ATTACH][/QUOTE]</p><p><br /></p>

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