136 Coloring of gold

Letter# 136

Coloring of gold

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I have a question regarding the colors of gold plating. I got a sample from a customer of a bracelet that was gold brushplated. The color to me was very yellow, almost flourescent it was so bright. I sent the bracelet to see if I could obtain a solution so I could plate that color. The supplier said it was red gold and had a copper additive. I have rose gold here which has copper, when it is plated, it looks like there is no gold in it, just red copper. We have a normal cobalt hardened acd cyaniode gold we use for brushplating that has a what I call a reddish cast to it that is fairly deep in color. The baths we are using are acid cyanide. Has anyone out there got experience with gold colors that could help me or perhaps point me to somewhere I can get help. The colors I see seem not to coincide with what the gold is called (red,rose,etc.).

GoldTouch

Gold coloring is a treasured artform that I can't pretend expertise or experience in, so I hope you can get an autoritative answer from someone else here. But in the meanwhile, Alfred Weisberg's handbook article on the subject, which can be found in both the Metal Finishing Guidebook and the Products Finishing [link is to product info at Amazon] Directory, gives charts of the various colors and the percentage of copper and nickel, etc., used to obtain them.

Ted Mooney, P.E.
Finishing.com Inc. - Brick, NJ

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Hi,

I think this the problem of the more copper content in the bath with more than what they are recommended. So please reduce copper content in your bath mean while may there may be one cause if PH is more this problem arises. Check your PH of your bath and then if bath containes organic contamination also one of the problem.

VADLAMANI SREENIVAS
- Hyderabad, Andhra Pradesh, India

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