Gotta be careful with rainbow toned coins. I happen to like them BUT,
I have had some fun with some freshly issued cupronickel coins, using a kitchen stove.
With the careful application of heat after several failed trials, some very nice multi hued coins can be produced!
I wouldn't have the nerve to treat an MS silver dollar to this sort of abuse, perhaps some others may!
I was reminded of this sort of tom-foolery after looking at some overheated mild steel plates.
Don't get me wrong. I think this coin is the real deal, anyway.