I wonder if warming up the surrounding steel would prevent the condensation Steve spoke of?

I have a Mauser mod. 66S with .30-06 and .243 barrels that is in almost new condition other than the fact that the receiver bluing has turned a bit purple. I understand this is due to high nickel content in the steel. Anyone know if this is reversible without stripping and rebluing?

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