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<p>[QUOTE=&quot;rmpsrpms, post: 24614779, member: 31773&quot;]I have been running an experiment for almost 40 years where I put a few 1955-S Cents from a gem BU roll into different storage conditions, and have periodically checked them to see if they&#039;ve toned. One went into an old coin bank (metal, screw together, not sealed) and the bank has been in various drawers over the years. The coin is still just as bright as the day it went in. Another went into a Kointain, and again just as bright as at the start. One went into a pressure-fit sealed plastic display container with a bit of foam, can&#039;t remember the brand, and it is a spotty mess. One is in an open tray in a drawer, and it has darkened a little but still a nice red. I didn&#039;t do any in open air. In 40 years they&#039;d be quite dusty and I&#039;ve moved at least 6 times in that period. Anyway, I&#039;d conclude that a clean RD coin should stay red for many decades if some care is taken in its storage. I would agree that a slabbed coin, if it is still RD after a while in storage, it will probably stay RD indefinitely. On ther other hand, I&#039;ve seen many &quot;RD&quot; coins in slabs that are spotty and tarnished and fingerprinted, but I don&#039;t think the storage medium is at fault.[/QUOTE]</p><p><br /></p>

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