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<p>[QUOTE=&quot;BadThad, post: 8592582, member: 17261&quot;]Thanks for your post - quite interesting.</p><p><br /></p><p>What percentage of your rolls do you find corroded/ruined from improper storage?</p><p><br /></p><p>I&#039;m probably somewhere around 20% for OBW. If not fully corroded, the start of the green or dreaded black spot cupric corrosion. Just last week I cracked a 1962 OBW and found this type of black corrosion on most of the coins - the roll was a complete bust. When I crack a roll and see any of this type of corrosion - the roll is usually doomed. If not very heavy corrosion, they develop those little black spots of cupric oxide - the terminal phase of corrosion.</p><p><br /></p><p>I attempted conservation with VC just for fun, the results were not good - as I expected. This type of black corrosion CANNOT be removed without damaging the coin. Before and after pics, soak time ~15 min, toothpick method.</p><p><br /></p><p>[ATTACH=full]1513271[/ATTACH] [ATTACH=full]1513272[/ATTACH] [ATTACH=full]1513273[/ATTACH][/QUOTE]</p><p><br /></p>

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