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Best conditions for allowing old copper to re-tone?
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<p>[QUOTE="BadThad, post: 2125300, member: 17261"]I've retoned quite a few Lincolns over the years, even got through NGC and PCGS after failing the first time.</p><p><br /></p><p>I would NEVER use any sort of chemicals, other than some xylene to strip the surfaces of surface residues. All I do is put a small piece of cardboard in a window sill and set the coin on it (no holder obviously, just the naked coin). I flip it every once in awhile. This process can take as long as 2-3 years but it does work....but every coin is different.[/QUOTE]</p><p><br /></p>
[QUOTE="BadThad, post: 2125300, member: 17261"]I've retoned quite a few Lincolns over the years, even got through NGC and PCGS after failing the first time. I would NEVER use any sort of chemicals, other than some xylene to strip the surfaces of surface residues. All I do is put a small piece of cardboard in a window sill and set the coin on it (no holder obviously, just the naked coin). I flip it every once in awhile. This process can take as long as 2-3 years but it does work....but every coin is different.[/QUOTE]
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