Best conditions for allowing old copper to re-tone?

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.

 

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This coin looks like it has oil or something else on it. It should be striped with xylene before starting the retoning process.

 

Zombie thread. He got the coin about 3 years ago J/K

 

LMAO! I wonder if it retoned yet?

 

They are still around I wonder if more pictures can be posted.