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Message:: [QUOTE="johnmilton, post: 7823987, member: 101855"][ATTACH=full]1344477[/ATTACH] [ATTACH=full]1344478[/ATTACH] The Capital and Capital style holders provide good protection so long as they were not contaminated with some impurity before the coins when into them. Some people go as far to say that these holders should not be re-used if the coins originally mounted in them are replaced. I think that is a little over the top. I bought this 1950 Proof set in this holder more than 30 years ago. The toning you see on these coins was there when I bought it. In my perception, this set has not changed over that time. Therefore I would say that these holders provide very good but no perfect protection from chemical changes. They provide excellent protection from physical damage, if the coins do not rattle. Although some of these style holders have a rattle problem, it's been my experience that the Capital brand holders have virtually no problems with that. As a bit of advice to beginning collectors, don't be put off if an older set like this has some toning, especially on the silver coins. Toning is a natural process. I would much rather have an old silver Proof coin that has never been dipped over one that has been dipped white. Undipped coins have better luster and are more attractive in my opinion. Chances are the dipped white coin will tone again, and sometimes the results from that are not pretty.[/QUOTE]