I actually have 2 examples like this, not sure what caused this type of toning, but it's kinda cool. Bright on the obverse, and green glowing edges on the reverse. The luster is more subdued on the reverse, but it is there.
I just bought a book on Amazon the other day called "Coin Chemistry"...hasn't arrived, yet. It's supposed to discuss the various types of toning on a variety of coins...should be interesting. I'll let you know if there's a reference to this.
It looks as if the coin has something on it - all those bumps - and that is what is causing the toning in that color. I suspect environmental damage of some sort.
I was told that this could have come from the coins being placed in wooden coin album or on a wood surface to cause that odd toning. There are fine little bumps on the surface; they probably wouldn't grade. No big deal, I paid < $2 for both. Haven't seen anything else like it - yet.
"Coin Chemistry" by Weimer White arrived today! Very imformative...but it doesn't go into which compounds produce particular types of toning...(sorry). The focus of the book is on coin preservation and the affects of various cleaning techniques.
GDJMSP, Are you referring to the little white bump looking things? If you are I have seen this quite a bit when trying to photograph coins in 2x2s in my case it is dust on the mylar of the 2x2 that is almost impossible to get to stay off long enough to photograph the coin close-up due to static pulling the dust back on the mylar every time I try to wipe it off. I finally learned to get a quality close-up of a coin I had to take it out of the 2x2. After much trying to wipe it off and driving me crazy:goofer: Stewart
