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<p>[QUOTE=&quot;cpm9ball, post: 2197196, member: 24633&quot;]I need to add one more observation which has not yet been mentioned.</p><p><br /></p><p>It is generally accepted that NGC holders are not 100% resistant to outside elements like air or water. However, it is also accepted that the seal of the slab is sufficient to retard toning significantly. If this were not true, then coins that had been encapsulated many years ago would continue to tone until they turned black. I owned many encapsulated toned Morgan dollars for 20-30 years, and the toning never changed.</p><p><br /></p><p>Chris[/QUOTE]</p><p><br /></p>

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