Here is one that i picked up from an older gentleman recently for below grey sheet bid. 1964 proof set with envelope and coa. I already own a pile of these sets but the LMC really caught my eye. Hard to get a good shot through the original cello packaging, but you can get the idea. Electric blue and purple. Yummy cent that would normally make me say AT, but in hand there is no question that it is NT.
I plan on doing just that. Too bad some of the silver does not have the same hues. The Jefferson does have that champagne color that they all seem to take on in old mint cello.
NICE! I love finding toners in these old proof sets. I have some Lincolns and Jeffersons that are outstanding.
Still, there would be those that would say you can gas a coin inside a cello pack with a syringe and a hypodermic needle.
Hypothetically speaking there are many ways to skin a cat. If it was a 58 D business strike Franklin sure there is what you could call motive. But a proof LMC? Not like it could bring more than a few bucks tops. Plus it is sitting in a complete set with otherwise blast white silver proofs. Not very likely.
If you leave it in the packaging, without sealing the whole package in another package, it will continue to tone to the point where it's ugly.
And that proves what? They will tone if exposed to certain contamination and moist air acts as a catalyst. If sealed, it does not tone. It only exposed to dry clean air, it does not tone. If the air is not dry and/or clean...........
Cellophane, even the newer cross linked kind, is NOT air tight, nor water molecules tight. It is often used in osmosis experiment, water purification , etc. because of this. Water and air molecules can and will diffuse through the cellophane depending on the gradient. Move a mint sealed set from a moist Flagstaff ( 7000') to Phoenix ( dry, 1100') and air molecules will move into the package at the same time water molecules are moving out. Move them back the next day, and if same conditions , the reverse will occur. IMO.
What i am saying is that they are not "air tight" to begin with. And neither are the slabs that tpg's use. Toning is created by certain environmental conditions, regardless of the holder that houses the coin. If you recall a while back, there were some people from certain message boards who had figured out how to tone coins that were slabbed without removing the coin from its holder. Air alone does nothing, you also need moisture, temperature, and time.
