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Message:: [QUOTE="imrich, post: 1046938, member: 22331"]An "Exception" Although I realize the futility of my response, my previous post being generally answered by unsupported statements, commonly known as HYPE, I post this response with reasonable facts which I believe can be readily supported. I again ask for supportive information, as a query, so that I might present proper supporting documentation, This response is intended to be educational, not confrontational. I believe you'll find the general term "Plastic" is that of a material state, which isn't "inert" by definition. "Plastic" may be relatively chemically/temperature inert as the Fluoroelastomers, relatively mechanically inert as glass filled PolyBenzImidazole, relatively temperature inert as some Polyimides,  relatively inert to "outgassing" as established by ASTM TEST METHOD E595, but still "plastic", having varying lesser degrees of resistance to influences, relative to that of a "solid" material (e.g. a noble metal). I could believe that: Dependent upon the cloth and coin material, an unusual phenomena as "surface marring" might occur, but would suspect that materials having greater density might also generate this condition. If the same cloth wrapping is applied to a coin as one might apply with a holder, abrasion/contact marks are unlikely. Cloth is generally osmostic or capillary in nature, removing (wicking) fluid molecules from a surface, where plastic is generally impermeable, allowing an identical concentration to that of a cloth wrap to condense on the surface, rather than be wicked. Try wiping your wet kitchen counter with a plastic bag, and then a towel. Since the plastic holders aren't air tight, moisture laden air is more likely to deposit/condense air borne residue inside a plastic capsule onto the coin surface, than a cloth wrap. The residue is unlikely to ever precipitate, as the thermal inertia of the coin is far greater than that of the relatively thin plastic "membrane". You are correct the sudden deceleration will disrupt glass surfaces, but I've noticed a similar phenomena when a plastic coin laden holder contacts the floor after being dropped. I suspect that a Polycarbonate non-contacting "window" would provide better protection than contacting plastic holders. I didn't realize that unfinished hardwood emits harmful gasses. Does Polyurethane, a more "durable plastic" than that I've viewed in holders, eliminate that condition? If your current information pertaining to Smithsonian institutional efforts are correct, please ignore my question pertaining to their practices. Thanks for your learned opinions provided to this skeptic. :thumb:[/QUOTE]

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