That is an interesting idea John.
I'm getting ready to do a bunch of copper, Shibuichi, and Shakudo patina tests, I will give that red hot one a try. I'll post results to you when I'm done.
Did Ian say if that was into a patina solution, or just water.
I have put quite a bit of molten, pure copper, and copper alloys, into boiling water as of late, and I can say the color has not been other than what I expected.
I would think that the long, slow patina method is the most likely.
I'll let you know.
Mark G