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<p>[QUOTE=&quot;7Jags, post: 4434461, member: 78719&quot;]Wow, that copper is a disaster waiting to happen. Interestingly, I have tried all the commercial solvents available in progressive fashion and as they are solvents they have mostly been ineffective against corrosion - this on cheaper coins &amp; no zincolns, etc.</p><p>I have had some luck on copper nickel coins with corrosion and CAREFUL up-titration of ordinary ammonia, but dilute and very gentle tamping of the surface with my favorite cotton buds (ie Q-tips) followed by immediate profuse rinse &amp; mild detergent and more rinse. Very dilute as in 1:4 or 5 and then ramp it up slowly. This is tricky on copper/bronze and there should only be short duration exposure of 10 seconds or so and observe what happens after the above rinse routine. I am not brave enough to try this on anything of value.</p><p>This seems to remove finger oils, or at least the acidic byproducts, when caught early and so some spots have been &quot;improved&quot;. But that surface on an unc. is really vulnerable to chemical reaction so have not been too brave. I had a 1970 proof English penny laying about and even with what I thought great care managed to cloud the surface in a most unattractive way (cheap coin, but dissuaded me from trying it on the actual two headed proof mint error I have of that date!).[/QUOTE]</p><p><br /></p>

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