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<p>[QUOTE=&quot;SuperDave, post: 2562679, member: 1892&quot;]No, the toning doesn&#039;t necessarily cease in a slab; they&#039;re not completely airtight. No, they won&#039;t all eventually turn black. It&#039;s not like PVC, where all the ingredients are already in place as long as you leave the coin in the bad flip - removing a toner from the atmospheric conditions which caused the toning will arrest it in place, as long as you keep those conditions away from the coin. </p><p><br /></p><p>Keep in mind some of those brutal textile-toner Morgans, which sat in sulfur-impregnated bags (anti-rat procedure) for however long it took to achieve the toning, and haven&#039;t changed since. If this one isn&#039;t already black, anything&#039;s possible:</p><p><br /></p><p>[ATTACH=full]552611[/ATTACH][/QUOTE]</p><p><br /></p>

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