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<p>[QUOTE=&quot;imrich, post: 2550313, member: 22331&quot;]I read your &quot;trade secret&quot; statement in passing through this thread initially, and thought you really don&#039;t want to know the ramifications of improper preparation steps, but let it pass without comment until I made the most expensive cleaning mistake of my long &quot;conservation&quot; education process.</p><p><br /></p><p>Over the years, as a scientist, I&#039;ve developed proprietary processes which are harmless to a coin, but will reverse environmental deterioration conditions without hairlines, etc..</p><p><br /></p><p>I&#039;d never tried a cleaner as Acetone which had been stated innocuous in many threads, which I was familiar as a volatile solution. I&#039;d although in the distant past seen the damage caused by various stated &quot;safe&quot; commercial cleaners.</p><p><br /></p><p>I was taking several valuable scarce date/condition Gold coins to a distant show for submission through a large volume dealer belonging to a same group as a dealer associate of mine.</p><p><br /></p><p>One of the coins was a MS64 1909 Double Eagle which I&#039;d previously removed from one of the top two premier TPG, for submission to the other for grading comparison. I&#039;ve attached a rough image of the coin in its &quot;Air-Tite&quot; temporary holder, before making my expensive mistake. The coin had been in a slab for ~20 years, and had a surface &quot;toning&quot; which I&#039;ve seen on many of my slabbed coins.</p><p><br /></p><p>I thought I&#039;d see if Acetone which I&#039;d purchased in the past, still in a sealed container, would have any affect on the toning if I added some solution into the holder, and just &quot;sloshed&quot; around for a short interval after lifting an edge and basting beneath. After closing the holder, and rotating for ~1 minute, the coin was welded to the holder, ruining a ~$6500 coin.</p><p><br /></p><p>When the coin was eventually extracted, it had plastic residue on the bottom face, a film on the top face, and plastic on my fingers, with epidermis damage.</p><p><br /></p><p>I&#039;ve now another &quot;opportunity&quot; to try reversing damage which would have been prevented if I&#039;d used normal precautionary measures than accepting stated experience of others. It&#039;s believed I&#039;ll eventually have an &quot;authentic&quot; coin with an ~75% reduction in value.</p><p><br /></p><p>JMHO[/QUOTE]</p><p><br /></p>

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