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<p>[QUOTE=&quot;adric22, post: 2269706, member: 38146&quot;]I&#039;m kind of baffled.. So, a little history here.&nbsp; Whenever I buy a silver coin, I clean it, then put it in a tube or airtite. (I know, controversial) And I realize that with exposure to oxygen they will all eventually re-tarnish.&nbsp; But here&#039;s the real mystery.&nbsp; I opened some old tubes today of some old half-dollars and I noticed the same thing in each tube.&nbsp; These have been in that tube for over a year without inspection. About one out of 5 had re-tarnished, slightly.&nbsp; These were all cleaned at exactly the same time, and have spent the same amount of time in the tube.&nbsp; I also noticed a tube of silver eagles, which I did not clean (because they were all brand new when I got them) have done the same thing.&nbsp; So why do some coins re-tarnish faster than others when they are all in the same environment, for the same amount of time?[/QUOTE]</p><p><br /></p>

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