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<p>[QUOTE=&quot;desertgem, post: 2168743, member: 15199&quot;]The only example of not being exposed is if the coin is embedded in a block of acrylic such as a paperweight. But that can never be completely removed without coin damage, so it doesn&#039;t seem a true option. Slabs and hard plastic holders minimize exposure, but eventually variations in air pressure will cause damage to the &#039;click&#039; seal or sonic seal ( slabs) and will allow ventilation of environment air in and out of the slab. Yes, very very minimal, but over time measurable.&nbsp; Even hard plastics have a minute diffusion coefficient of gases. Most environments that coins would love, humans would dislike. If you see rust anywhere , move. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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