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<p>[QUOTE=&quot;desertgem, post: 601694, member: 15199&quot;]There is a simpler test than the Oddy to see if any holder is truly tight from contaminants. Put drops of a water soluble ink in the coin space and seal it. Submerge the holder in a clear container of water for a week. If the water has no tinge of color after that period is is arguably air tight also. I have done this with &quot;airtite&quot; and Coinsafe ( which I think is the same company as the coinedge) and both failed within 24 hrs. Yet mylar 2x2 that I heat sealed passed readily. Once you pay for the $40 heat sealer, the mylar 2x2 method is inexpensive and also if you sell coins by mail, it prevents tampering for bogus returns.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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