buzz, the very simple to make 1873 Ordnance formula found in Angier's gives more of a blue finish rather than black. But you have to be very careful to dilute it properly and keep the rusting cycles short to keep it from biting too much, or it will leave a very matte surface. It does get darker as you make more passes, but still remains more bluish color than a lot of formulas. The hardest ingredient to find is iron nails, but small pieces of wrought iron would work as well. You definitely want to mix it outside in a good crock or crucible, because it generates a lot of heat and nasty fumes when you add the nails to the concentrated acids.

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