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<p>[QUOTE=&quot;cladking, post: 1306538, member: 68&quot;]Yes,&nbsp; this is the mottled corrosion to which I referred earlier.&nbsp; It is very difficult to remove and this is the last step before it becomes impossble to remove.&nbsp; </p><p><br /></p><p>I used to go through many many hundreds of mint sets looking for the finest sets and I had 20 of these sitting in a safety deposit box for many years.&nbsp; I was just shocked when I found all the clad like this and the silver even worse.&nbsp; I was able to save most of the coins with a series of soaks in acetone, isopropyl, and denatured alcohol.&nbsp; Many were ruined and some were unsavable.&nbsp; It was truly heartbreaking but a big relief when a few started coming out of the soaks in pristine condition.&nbsp; </p><p><br /></p><p>Some of them actually look pretty nice like this and the corrosion hides most of the marking.&nbsp; The services won&#039;t grade them and label these &quot;PVC damage&quot;.[/QUOTE]</p><p><br /></p>

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