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<p>[QUOTE=&quot;Colonialjohn, post: 2714922, member: 57741&quot;]I made a product specifically for copper alloy coins since I am a chemist but like the Moderator said here 99.9% of all products will hurt copper. I do sell or give to people close to me say in the C4 world and I had no complaints other than the product has a limit. My product on copper will not change mint red, cartwheel effect, safe on copper proofs and their finish but when you remove 100 year old toning there is an obvious visual change. Removing soil also takes some skill as not to create hairlines so I warn on MS copper coins. Its complex just like the coin chemistry of a good copper cleaner. The other factor is the &quot;degree&quot; of copper oxidation so if its superficial it will work - if its severe and has gone into the coin&#039;s surface its probably best to leave or just remove the superficial film. 99.9% of all collectors believe you can not clean copper effectively. Who am I to convince them otherwise ... LOL. I may bring some to Baltimore this November 2017 when promoting my second book &quot;Forgotten Coins&quot;.</p><p><br /></p><p>John Lorenzo</p><p>United States[/QUOTE]</p><p><br /></p>

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