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<p>[QUOTE=&quot;desertgem, post: 1258692, member: 15199&quot;]Staples penetrate the protective mylar of 2x2 or flips due to its use. If the staples are not stainless steel, they can eventually corrode and whatever causes the corrosion can also affect the edge of the coin close by. They do make stainless steel staples, and would be much better. I have such coins from the same era</p><p><br /></p><p><br /></p><p><br /></p><p>Verdigris and PVC damage are 2 different animals. Acetone won&#039;t remove verdigris which is corroded metal. Verdigris has a metallic appearance , where as the PVC damage are caused by the organic additives to the PVC to make it flexible, and they result in chemical action that can corrode the metal. Acetone can remove such additives, but if the damage has started to the metal, the damage will remain, but be inactive if stored properly hereafter.&nbsp; PVC usually has a slimy green or blue green appearance. If Acetone takes it off, then it is PVC. The additive needs moisture and environmental gases to increase, so many coins in PVC holders may have an invisible adhesion and appear Ok.&nbsp; However, if improperly stored, can increase. After 10 or more years, the additives are probably outgassed, and the holders are fairly safe, but I would dip the coins in acetone and transfer to mylar lined 2x2 or the safelips you mentioned. Some will mention other storage such as Airtite (tm), but they are not air tight either. The best solution would be an inert gas, or a vacuum, but these are not usually feasible solutions. </p><p><br /></p><p>Verdigris or corrosion initiated by PVC , require environmental gases which usually contain sulfur, other corrosive reactants, and water to increase. Reducing these components help protect the coins. Some use Zip Lock bags for albums or bunches of 2x2s and this works well, although not the best for presentation <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />&nbsp; PVC flips are still sold as they are inexpensive and flexible and won&#039;t scratch ( rub) the coin as mylar flip edges can.</p><p><br /></p><p>If I missed something let me know.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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