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<p>[QUOTE=&quot;desertgem, post: 1835225, member: 15199&quot;]Slabs do a lot to protect, as do air-tites, ziplock food bags, other inert plastic containers, and others, all which are not airtight. The causative agent of toning/corrosion are active chemical entities such as sulfides, oxides, etc. that can form a thin interference film on the surface of metals ( the environment as you say). But with&nbsp; a tight fitting slab, there is very little exchange of atmospheric type of gasses in and out of the interior of the slab ( unless you squeeze it like an exercise ball, or blow through the edges, apply and release vacuum ( How some coin doctors tone within a slab), etc. Normal tight fitting enclosures only allow very minor diffusion of say sulfides, which is almost zero when compared to a coin open to atmosphere which circulated over it and allows renewed exposure to sulfide every second. </p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p>Toning will not be determined by the plastic slabs unless there are defective or ill-sealed procedures by the TPG. Only such slabs which allows greater exchange of gases will allow ( not Cause) toning.[/QUOTE]</p><p><br /></p>

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