Most will probably never be found, not many people are willing to bend over to pick up a cent.
63
It's verdigris, not sure why all the mystery. You have a coin with copper in it, if exposed to air/water, verdigris will form. As Doug mentioned,...
Beautiful RB coins!
If these are silver, a quick in in EZest should take care of it.
My HIGHEST raw coin: [IMG] [IMG]
65/66RD IMO....it's a primo example!
Love that broadstrike!
Does it have cartwheel luster?
Did you try DI or distilled water? Sounds like it's probably a polar compound of some sort if you tried solvents and they failed. If you try water...
What solvents did you try on the "hard residue"? Is the fuel 100% ethanol?
Nailed it!
No way the sniffer has the sensitivity to pickup trace thiourea. As an analytical chemist I'd have to submerge the coin in a solution to extract...
The "sniffer" cannot detect what has been done, that's impossible. It detects things that are still on the surface. Based on the analytical...
And another thought - I'm no polymer chemist, organic is your world but... can't a chain break at the ether linkage with a little hydroxide...
Probably not the toning, I was referring more to the natural, organic-type surface layer, some call it a "skin". The slow adsorption of elements,...
The problem is not broken-down polymer removal, the right organic solvent(s) will dissolve it (THF comes to mind). The issue is that acetone broke...
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