Wow - that's beautiful! I've never seen a blue and gold combination like that - my first guess is that the copper content of the coin is higher than usual and not evenly combined in the coin, thus causing it to tone in this manner - amazing!
I agree with FC57Coins that it would be the copper. Gold is noble and should not oxidize at all. Copper will oxidize practically the moment it enters the atmosphere, i.e. right after striking.
Comments
Frank
Russ, NCNE
Tom
If I had it my way, stupidity would be painful!
If I had it my way, stupidity would be painful!
Can someone help?
Thanks