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topic 3970

Colouring of Gold or Brass


(1999)

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


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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 ltr no 3970.

Thank you,

Arun Sharma
electroplater - Meerut, UP, India


(2003)

Different colors for brass(luster series):
copper acetate......25 gm
citric acid........ 30 gm
sodium thiosulphate..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 copper acetate you can use lead acetate and instead citric acid potassium tartrate. Pranam!

Goran Budija
- Zagreb, Croatia



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