it aint the bone and charcoal that should be worrying you...its the 1400 degree F heat, typically needed to reach quenching temp that should be of the most concern...
and then there is the unknown tempering spec, to bring the frame metal back from a glass hard brittle state ...no one alive knows what that was...
suggest you leave it be and not mess with the factory heat treating...why not polish the frame to a satin finish, as seen on some english made redone guns...
I could leave it alone, but I'd rather have some color to it. I sure is hell won't be putting torch to it like you would.
