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<p>[QUOTE=&quot;Michael K, post: 2894304, member: 78298&quot;]I imagine there is a Shrodinger point when the environmental damage is not just on the surface anymore, but is etched into the coin.</p><p>Unless there is a numismatic conservation specialist with some secret formula, the only way to get this crud off the coin would be either abrasive (steel wool, grinding wheel, rock tumbler). Or some very strong acids or other solvents, which would only damage the coin by scraping off a layer of metal along with the crud. We have all seen these shiny coins.</p><p>Even if the OP were to do a very gentle cleaning which would not damage the coin, you could end up with various patches of light and dark, and it would still look worse than it does now.&nbsp; Leave it alone and just shrug your shoulders and label it ED. Still a good date coin in decent condition (apart from the ED).[/QUOTE]</p><p><br /></p>

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