I use distilled water from the drugstore--it's only like $3/ gallon, and my smaller bluing tank only uses 3-4 gallons. No big deal, if we're talking about a few hundred bucks for the bluing job. If you see oil drops coming to the surface of the boiling tank, a half piece of paper towel laid onto the water surface, and quickly picked up, BEFORE you pull the barrels out will ensure the oil will not contaminate the steel, and make a camo job out of it.

hippie redneck geezer