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<p>[QUOTE=&quot;GDJMSP, post: 482019, member: 112&quot;]Yes it is well known that coins can and will tone in a slab. It has always been known. It is only people&#039;s mistaken belief that slabs are airtight that promulgates the idea that coins will not tone in a slab.</p><p><br /></p><p>This goes for them being toned by a coin doctor AND natural toning. Natural toning can and will occur to a coin in a slab if the slab is not stored properly.</p><p><br /></p><p>If stored improperly, toning can occur to a coin stored in anything except a vacuum or an inert gas.[/QUOTE]</p><p><br /></p>

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