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<p>[QUOTE=&quot;Oldhoopster, post: 6379178, member: 84179&quot;]Just a couple observations to add</p><p><br /></p><ul> <li>I first heard about PVC residue damage in the mid&nbsp; 80s, and suspect it was publicized before that.&nbsp; I was able to get trichlorotrifluoroethane (freon 113) from the college chem lab to remove the reside.&nbsp; That stuff worked great but was banned for destroying the Ozone</li> <li>Many dealers use soft PVC holders because they&#039;re flexible.&nbsp; The safe flips will crack and break if they&#039;re opened and closed too many times.&nbsp; Think about how many times a flip can be opened at shows as collectors look at the reverse.&nbsp; That&#039;s why every coin I purchase gets a quick acetone dip</li> <li>The window in cardboard 2x2s is mylar and have been that way for as long as I can remember.&nbsp; I have coins that I put in 2x2s 45+ years ago when I was a kid that show no damage.&nbsp; Rusty staples are a concern if you live in a humid area or store your coins in a damp basement</li> </ul><p>[/QUOTE]</p><p><br /></p>

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