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<p>[QUOTE=&quot;Lehigh96, post: 412786, member: 15309&quot;]I have been collecting rainbow toned coins for years and have never seen any of my NGC or PCGS coins turn in their holder.&nbsp; I keep the coins in a cool dry environment and check on them often.&nbsp; If you are really concerned about the coin turning, intercept shield makes a product that is designed to house a slabbed coin.&nbsp; I use this product only on toned copper coinage.</p><p><br /></p><p>Keep in mind that most rainbow toned Morgans resided in canvas bags in bank vaults for decades and are still in stage one of the toning process.&nbsp; In order to advance to stages 2 or 3, the coin must remain in an environment conducive to toning.&nbsp; In other words, there must be a source of sulfur to create the hydrogen sulfide gas that reacts with the silver and oxygen to cause the silver sulfide film (toning).&nbsp; Although slabs are not completely air tight, they provide a reasonable measure of protection as long as they are stored properly.&nbsp; </p><p><br /></p><p>There is some evidence that coins that have sulfur content on the surface of the coin prior to encapsulation will continue to tone.&nbsp; I have never been able to find any source that explains how this would happen naturally but I don&#039;t believe there is any way to stop it from happening.&nbsp; My guess is that coins that are AT where a sulfur compound (liquid) was applied to the coin and improperly rinsed would still have sulfur on the coin.&nbsp; If one of these coins was encapsulated it would definitely continue to turn in its holder.&nbsp; All the more reason to make your best effort to stay away from AT coins if at all possible.</p><p><br /></p><p>I don&#039;t have any slabbed coins to show you, but I will show how a raw AT coin continued to turn after I purchased it.&nbsp; This coin turned in a matter of months.&nbsp; Had the coin been slabbed, I believe this process would have taken years, but you can see what I mean by turning, the pink has completely yielded to dark blue.</p><p><br /></p><p><img src="http://i117.photobucket.com/albums/o59/ACPitBoss/FranklinHalfDollar1963ATbeforeandaf.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>I know this has been long, but I hope it has been helpful.&nbsp; Paul[/QUOTE]</p><p><br /></p>

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