I just blued a Luger sideplate with Mark D's formula, and I got the same result as Terry. It blued quickly and easily, but ended up being the same "greasy black" as you get using Brownells formula straight out of the bottle.
One thing I noticed was that the modified formula was very thin. I usually heat the parts with a hairdryer and apply just enough formula to wet the surface. It will dry in a couple of seconds, and you will see a thin, dull coat of dried formula after the application. With this formula you could barely see that you had applied it, so maybe you need to use it in a "more aggressive" way, like applying several coats, using higher humidity etc? Mark's pictures of the rusting show a lot of red rust, but I didn't get any of that.
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