Trichloroethane. No, not just a solvent. The chlorine apparently acts as a contaminant that prevents sticking of the steel to the tool and makes it much more slippery. I read about some demonstration video Castrol did showing the difference, according to the guy that mentioned seeing the video it was quite eye-opening.trichloroethane, trichloroethene, trichloroethylene?
anyway, i worder what there is to it, as they are good solvents/degreasers. i assume they were the carrier for another substance that facilitates the cutting. so maybe no mourning over it neccessary?
All I know is it works, and WAY better than anything else modern that I've used. I've got one can of 1,1,1 trike-containing cutting oil left, and it's night and day when using it side by side with any other modern stuff, including Moly-D etc. Beautiful thread finish, super easy to turn the tap. The caveat is that it's only useful for steel or tougher alloys etc. It will discolor and possibly damage aluminum. But of course that's mainly where one would want to use it anyway, on tougher stuff.