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Q&As since 1989


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Colouring of Gold or Brass

Dear Finishers

I would like to colour the gold with pink, green, white, black and yellow (& other possible colours). I would like to try the same colours on brass too.

If you could give some formulations and processing conditions for the above colourings, I would be greatly obliged. The process can be either a dip process or electrolytic, but at room temperature.

I thank you in advance for the help.

Regards,

Dr.K. Murugan
- Mumbai, India
1999

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2001 Dear Finishers: I would like to colour the gold with pink, green, white, black and yellow (& other possible colours). I would like to try the same colours on brass too. If you could give some formulations and processing conditions for the above colourings, I would be greatly obliged. The process can be either a dip process or electrolytic, but at room temperature. I thank you in advance for the help Aladdin Meraji - Eagle Pass, Texas Please give me answer question thread no 3970. Thank you, Arun Sharma electroplater - Meerut, UP, India 2002

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2003

Different colors for brass(luster series):
copper acetate [affil links]......25 gm
citric acid [on eBay or Amazon] ........ 30 gm
sodium thiosulphate [on eBay or Amazon] ..280 gm
water...............1 lit
Cold immersion(25-30 C)

Sequence(on brass):golden yellow-copper color-violet-dark blue-light blue-chrome color-nickel color-reddish gray.

This colors can be lacquered. According to literature this colors can be obtained on gold, platinum, silver,nickel and iron(only blue). Instead of copper acetate you can use lead acetate and instead citric acid potassium tartrate. Pranam!

Goran Budija
- Cerovski vrh Croatia