Doug, the thing I was worried about is the temperature of the bath annealing the case hardening.

The top lever that I made from a hammerless one, I used cold blued it a few times and it matched the rest of the metal ok.

I just polished this one and it came out shiny. The bluing on it wasn't too bad for a gun built in 1901.
I buy these "klunkers" as Russ Ruppel used to call them, and it gives me a chance to work on them and fix them up.
In the last year or so I really got into hammer guns, and like the pre-1897 ones with the back action locks. But if the price is right, I will get the later ones like this one.

David