Black chrome plating can also be plated in the same way and still have similar characteristics to the bright chrome. For aesthetic or anti-reflective applications, it may be preferable in some cases. I have not yet used it, but the formula is as follows:
Chromic acid 33 oz (936 g)
Acetic acid = 28.2 oz (800 g)
Barium acetate =1.0 oz (28 g)
Distilled (or demineralized) water to make 1 gal. (3.79 litre).
Operation of this bath will be at 90° to 115° F (32.2° C. to 46.1° C.) and at a current density of 0.25 to 0.63 AIsq.in. (More on how to set this up later).
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