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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Best, easiest and safest brass bright dip

I run multi-spindle screw machines. I would like to get a easy to use and safe bright dip to equalize the color from a machined surface to a un-machined surface on 360 HH brass. Can anyone suggest someone that could help me get set up the right way?

Jerald Welch
- Cookeville, Tennessee
2006

If it were my shop, I'd probably try sulfuric acid plus proprietary stabilized hydrogen peroxide first, Jerald. It at least avoids the use of chrome, persulphate, or nitric acid. There wouldn't be multiple choices of processes though if any one of them were best, easiest and safest. So the alternative processes have something to be said for them as well. Good luck.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2006

Comparatively safer and less toxic bright dip for copper alloys: 800-890 ml water
60-150 ml hydrogen peroxide
30 ml sulfuric acid
20 ml ethyl alcohol
Use only fresh solution! Hope it helps and good luck!

Goran Budija
- Cerovski vrh Croatia
2006

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