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<p>[QUOTE=&quot;desertgem, post: 2187667, member: 15199&quot;]PVC ( Rigid)&nbsp; itself is stable enough to store or bury sealed with metal and not cause any reactions. HOWEVER, flexible PVC ( such as in holders contains Plasticizer molecules to make it flexible, and in the presence of moisture, it can leave the PVC moiety and react as an organic acid on the coin it is containing. Not overly strong , but if left alone for extended time, can do visible damage. After 4 years plasticizer content in the the PVC is still 92 percent, but within 9 years, it is about 60%, and that is the stage where most damage probably starts, as once it reached that level it stays fairly stale for the next 20 years, except that also means it cracks more and is not very flexible.</p><p><br /></p><p>Acetone can not remove tarnish, so the grey will stay unless you use a dip ( acid such as EZ-Est is much safer than cyanide, even for chemists )</p><p><br /></p><p>The better chemists I know say no water rinse after the last acetone rinse, as acetone takes excess water with it, leaving a very water free coin, so why add a possible harming substance right as you put it into a holder?[/QUOTE]</p><p><br /></p>

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