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How to turn 18K gold to a glossy black colour?

Dear Experts,
I am a jeweller and have been asked to make a cuff style bangle in 18K gold. The bangle is a simple smooth cuff shape 11 cm long (along arm) and with a glossy black finish around a motif. As it is a bangle it may be sprung open slightly to fit on the wrist, and it will need to withstand knocking that is inevitable with cuffs. Can you please recommend how I can create a fit for purpose glossy black surface on my 18K cuff.
Thanks for any advice you can give.
Andrew,
Penang, Malaysia

Andrew Phillips
Jeweller - George Town, Penang, Malaysia
August 18, 2011

August 22, 2011

1.
Oil it with linseed oil(very,very slightly),then heat it to 200- 400 °C (slowly).Repeat if needs!

2.
copper or silver plate it and then colour it with liver of sulfur [on eBay or Amazon] solution

3.
plate it with black nickel or black chromium or black palladium

Hope it helps and good luck!

Goran Budija
- Cerovski vrh Croatia

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