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<p>[QUOTE=&quot;Michael K, post: 26780558, member: 78298&quot;]Going back to the bank vault toning. It would depend on the &quot;canisters&quot; or other methods of containing coins, which are usually burlap bags, and the gases contained inside the vault. The vault would be opened from time to time and other pollutants could be introduced besides oxygen, nitrogen, carbon dioxide, etc. Now in my own personal experience, I kept State quarters and National Park quarters in&nbsp; 35mm film vials for over 20 years. And the coins DID NOT tone. After I put them in albums, they still look great but the earlier ones show more toning than the newer ones. A lot of that is because of the materials in the cardboard in the albums, however, when the coins were kept in the film vials they didn&#039;t tone over many years. So the bank vault is a possibility. But I don&#039;t see how the coins would stay blast white over 100 years of this type of storage. Especially in burlap bags.[/QUOTE]</p><p><br /></p>

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