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<p>[QUOTE=&quot;digitect, post: 1494813, member: 38157&quot;]My coins toned just as these did, from the edges where the coin touches the album toward the center. This is caused by the chemicals in the album papers, cardboards, glues, and inks. However the coins I have stored in Mylar-faced (boPET) cardboard holders since the early 70&#039;s are as perfect as when they went in.</p><p><br /></p><p>Direct contact with acidic papers or other chemically non-stable or incompatible materials (specific to metal/alloy) will obviously alter coins. I can understand that some opinions will believe this is okay or even desirable for aesthetic purposes (thus my distressed furniture comment), but we simply can&#039;t ignore that these are molecular changes on the surfaces. I&#039;m just arguing to call it what it is. I doubt there are many numismatists who would view enamaling color on an MS Morgan as preservation. So my original question was to truely ask this community if there was some desirable preseverational aspect of toning that I was missing. It sort of shocks me to read a thread where coin alteration is preferable over preservation!</p><p><br /></p><p>My goal is to avoid changing my coins as much as possible. For now, I&#039;m using Mylar in a temperature and humidity controlled environment. There may be other stable plastics, but I&#039;m trying to avoid any that off-gas or leach. (Obviously PVC, but maybe PMMA and PC, too.) I suppose it goes without saying, but I also avoid anything with wood, paper, ink or die, glues, whiteout, tape, and cloth, too.</p><p><br /></p><p>Not trying to stir up dissension here, just truly wondering where others come down on this. I&#039;m new here and haven&#039;t bumped into this converation yet. I&#039;ll go back and catch up on the thoughts after this![/QUOTE]</p><p><br /></p>

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