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Black zinc chromate finish

We've been able to do yellow/gold colored zinc chromating using a simple formula of chromic, sulfuric and, nitric acid. Can anyone share their knowledge on black colored zinc chromating?

L. L. Lozada
- Philippines
2001

The finishing business is done differently in the States; I haven't seen a shop try to formulate their own chromates in 25 years. But black chromates (for zinc) will involve silver compounds.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
(Ted is available for instant or longterm help)

2001

2001

It would be great if you can share the formula of gold colour chromate, as I have not been able to develop one.

Thanks,

Oscar Infante
- Chile

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