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Problems with black chrome bath

My name is Daniel Hernandez, we have Black chrome made of 33 oz/gal of chromic acid, 1 oz/gal of barium acetate, and 22 oz/gal acetic acid [on eBay or Amazon], the finish is a slight gray but it is not black as I would like to see it. is this normal?
thanks very much

DANIEL HERNANDEZ
plating shop - COLOMBIA
2006

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