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<p>[QUOTE=&quot;medoraman, post: 2562686, member: 26302&quot;]I mostly agree, but do believe it can be stopped. However, once toning is on a coin, its much more liable to have MORE toning. So, therefor, its harder to stop toning progression on an already toned coin than a non-toned one. Many coins I owned that were toned really pretty are now darker, and this is with me putting in sacrificial silver, a dessicant, and other things to stop it.</p><p><br /></p><p>I believe its a huge danger toned coin collectors face and many have no idea that eventually the premium they paid for the &quot;pretty&quot; coin will go away.</p><p><br /></p><p>If a coin is in a slab it helps. Put those slabs in ziplocs, in a safe with dessicant and some loose sacrificial silver, in a humidity controlled environment, and it will prolong it. However, one hour in a poor environment can ruin a decade of good preservation.[/QUOTE]</p><p><br /></p>

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