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<p>[QUOTE=&quot;Oldhoopster, post: 8161284, member: 84179&quot;]The cardboard flips use Mylar windows, which is safe.&nbsp; I like to brush off any cardboard dust before using because there is a small chance the particles could cause discoloration.&nbsp; I have only had this happen a few times and have multiple binders and boxes of coins in cardboard 2x2, some going back 50 years but I don&#039;t want to risk it.&nbsp; </p><p><br /></p><p>I do not recommend the self seal 2x2s with the adhesive. I don&#039;t know if the adhesive can off gas and damage the coin, so I don&#039;t take a chance.&nbsp; Crimped staple on regular cardboard 2x2s work for me</p><p><br /></p><p>I also use SafFlip brand plastic flips.&nbsp; They are made from mylar.&nbsp; Downside is they are somewhat brittle and the fold can break if you open and close them a lot</p><p><br /></p><p>Hope this helps[/QUOTE]</p><p><br /></p>

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