John, thank you for pointing a very interesting article. I have been looking for a simple salts blue solution for a long time and am wondering if anybody has used this one and how it compares to something like Brownells blueing salts. I have used Pilkington's Rust Blue solution for a number of years in my junker rebuild projects. I get great results on S&W's, Winchesters and Colts. The color can be varied from a light, almost translucent blue to dark blue black depending on the number of coats applied and the humidity. Only drawback to rust blue is the long time it takes to process the metal; that and the fact that a rust blue sometimes just isn't "right" for a particular firearm.
Charlie
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