Ken, that would be a good question for Doug (PA24)or someone else who actually does color case hardening, and does it well. But it is my understanding that if you are merely polishing to clean rust or patina off the action or parts before re-case coloring, then there is no need to heat that steel to an annealing temperature which is well above normal bone pack case hardening temperatures. We've all seen those guns that had those original mottled case colors polished off to a high shine by someone (notice that I did not say idiot!) who preferred that look.

Voting for anti-gun Democrats is dumber than giving treats to a dog that shits on a Persian Rug