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<p>[QUOTE=&quot;Kentucky, post: 3433869, member: 33176&quot;]...speaking of chemistry...the problem with PVC (polyvinyl chloride) is that it is really a rigid solid and to make it flexible they pump in lots of a plasticizer that is kind of like an oil, it makes it flexible, but it can exude over time and that is why whatever you have in contact with it gets sticky.&nbsp; Now, the plasticizer really isn&#039;t acid, but it can trap lots of stuff and hold them close to the coins.&nbsp; The PVC by itself can decompose over time and give off what Doug was talking about, hydrogen chloride gas, which forms hydrochloric acid when dissolved in water.&nbsp; If the PVC is giving off hydrogen chloride, it is probably starting to look yellowish.&nbsp; Acetone is pretty cheap and you really should consider giving all your coins a bath.&nbsp; You can put lots of them in a container (glass please) and clean them all at the same time.&nbsp; Just remember to change the acetone a few times and dispose of the old stuff carefully.&nbsp; The safest plastic to use would be polyester (PET, polyethylene terphthalate, terelene, etc.) but polyethylene and polypropylene should be safe too.[/QUOTE]</p><p><br /></p>

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