Removing Toning From Proof Coins

Actually , if you want blue, soak your copper in battery acid!

 

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I might have to try both a copper and a zinc from the 80's.
Au pocket change.

 

Not a bit. Their location DID change just this past October, though. Similar proof cents NOT in slabs, but in similar outer boxes, in the same room, did NOT tone, blue or any other color. They were in Saflip brand flips.

 

what do you think the toning is made from?

If it doesn't react with the metal, the toning wouldn't be affected.

 

I must say the WORST in-slab toning I have is a 1955 PF67CAM nickel that doesn't even look like a proof at all anymore, much less cameo, and it is in an "after the ANA, but still small slab (Amos era) ANACS" slab.

I'm thinking of letting NGC's conservation folks take a run at it. When it was first slabbed it must have barely missed "Heavy Cameo". It was a "mahnstah".

 

Sure looks as if someone rubbed something on that coin...they left brush marks!

 

Kurt Bellman, posted: "Yeah, yeah, I 've got a few cents with lots of blue on them. Funny thing is - that blue WAS NOT THERE when they went into ANACS plastic, and now it is there."

Thanks for making my point posted previously using your coins an examples:

"The blue color on copper can be produced in seconds by a coin doctor or conservator (in this case not on purpose as I've done it ) or naturally over several years."

Your coin turned blue while sealed in a slab. Therefore something in the environment "turned it!" ANACS plastic case? We all know the old PCI slabs toned coins over a period of time. Now we all need to decide for ourselves is what we consider "natural" toning.