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My dad was a gunsmith and did restoration work for Abercrombies back in the day,as I recall,he used a tiny electric kiln to do small parts,was alot of voodoo envolved in the process,differant animal...

Not the same,case hardening with colors is done in a furnace,packed with animal matter,teeth,hooves,bone,take many days to get the colors correct,look here:TurnbullMfg. Co. for firearm restoration of...

Actually it offers little if any protection against rust and corrosion as true bluing is a form of controlled rust.
It is used because it is traditional,to die for when done in the oldworld...

True rust bluing is done with nitric acid,I restore high grade american shotguns and can tell you a set of barrels takes at the least 3 weeks to do.
all has to be ultra clean,I boil parts in a borax...