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Letter# 136
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Gold coloring is a treasured art form that I can't pretend expertise or experience in, so I hope you can get an authoritative 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.
++++ Hi, I think this problem is of more copper content in the bath with more than what is recommended. So please reduce copper content in your bath; meanwhile maybe there may be a cause if pH is more this problem arises. Check the pH of your bath and then if bath contains organic contamination that also may be one of the problems. VADLAMANI
SREENIVAS
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