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<p>[QUOTE=&quot;kaparthy, post: 18590, member: 57463&quot;]As has been noted, slabbed coins do tone over time.&nbsp; The grading services use sonically sealed holders, but they are not environmentally inert.&nbsp; Keep the material from heat and light.&nbsp; Commercial products such as Kointain are well-recommended.&nbsp; Amos Press (Coin World) sells a line of chemically inert holders.&nbsp; There are others.</p><p><br /></p><p>As for 2x2s, I have seen old coins come out apparently pristine.&nbsp; I have seen others where chemicals from the staples have eaked over to the coin.&nbsp; Soft vinyl flips cause PVC damage and now we hear from PCGS that HARD vinyl flips can carry embedded particles that scratch high mint state or proof coins.&nbsp; A hundred years ago, collectors put their treasures in wooden cases, lined with felt.&nbsp; Then we learned that opening and closing the drawers caused &quot;cabinet friction.&quot;&nbsp; Of course, the woods also exuded vapors that toned coins.</p><p><br /></p><p>Heck, it seems an unsolvable problem!</p><p><br /></p><p>Again, just keeping your inventory away from heat and light is a good first step.&nbsp; I hang on to the the little packets of silica gel that come with vitamins and I put them in the box with coins. There are a lot of homebrew remedies.&nbsp; Nothing lasts forever.</p><p><br /></p><p>In the world of ancients, we have seen that coins from desert climates -- typically the Ptolemaic issues -- seem to last the centuries much better than those buried elsewhere.&nbsp; I guess that if you want to be really, really careful, you should build a pyramid in the desert.</p><p><br /></p><p>Miichael[/QUOTE]</p><p><br /></p>

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