Mark - yes, sorry for any confusion. I am really not up on this stuff. I guess all blueing is chemical. And then I guess the difference is whether it is hot or cold?? Maybe an expert can chime in on that one - I do seem to recall a few threads on this at some point in the past.
Anyway, you are correct - it is the stuff you get from the Gun Smith. I have tried both the liquid and the cream forms, and I prefer the cream. I also have blue and rust remover from the same place - it is nasty stuff, as it says on the back that it contains chemicals that are known to cause certain types of cancers in the state of California. Lucky for me I do not live in California!! :D
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James.