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<p>[QUOTE=&quot;Andy Herkimer, post: 2562833, member: 32344&quot;]I believe it depends. Once the toning has started it will continue as long as they continue to be exposed to environmental contaminants. I believe if you isolate them from those contaminants in a controlled environment and perhaps use intercept shield or such products, then the toning will stop.</p><p><br /></p><p>If you can reduce the environmental contamination to zero then in theory they will never turn black. However the final stage and color of toning is black, so if you do not isolate the coins successfully then they will eventually be black.[/QUOTE]</p><p><br /></p>

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