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<p>[QUOTE=&quot;gatzdon, post: 336061, member: 8247&quot;]OK, some are going to knock me for this, but for the cupronickel proofs, I have found that thioureic acid (silver cleaner from Walmart) works perfectly for removing fingerprints from proofs that I find in circulation.&nbsp; </p><p><br /></p><p>With the silver proofs, I would be hesitant before dipping those.&nbsp; Before considering it, make sure they are only worth their silver content in their current condition.&nbsp; For the silver, I would probably try just acetone first.</p><p><br /></p><p>If the fingerprints are fresh, they can be safely removed without damaging the coin.&nbsp; If the fingerprints are left on the coin for too long, they will react with the metal and make permanent impressions, even if the fingerprints themselves are removed later.</p><p><br /></p><p>Search Cointalk as there are many threads about dipping coins (along with both sides of the debates) to make sure you properly rinse them and leave nothing behind on the coins.</p><p><br /></p><p>and congrats on the finds.[/QUOTE]</p><p><br /></p>

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