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<p>[QUOTE=&quot;dougsmit, post: 4514123, member: 19463&quot;]The other question is how long it will be there.&nbsp; If the irridescence is a produck of a micro-thin layer of toning, continued action will go gray and then black.&nbsp; Will this take a year or a century?&nbsp; The coin may be around to know.&nbsp; We won&#039;t be in some cases.&nbsp; I have a few coins that I have owned for over 50 years.&nbsp; They are darker grey now.[/QUOTE]</p><p><br /></p>

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