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How do I quick oxidate brass to get a black finish?

How do I quick oxidate brass to get a black finish? After the black finish I need a green corrosion on the top.

Markku Timo
Brass items - Sweden
2005

For small pieces You can use 200 gm copper carbonate ⇦ this on eBay or Amazon [affil links] / 1 lit ammonia ⇦ this on eBay or Amazon [affil links] solution (cold immersion process, bad smelling, work outside, protect your eyes and hands). If You want to add some green patina after that You can use 250 gm ammonium carbonate/25o gm ammonium chloride/1 lit water solution. Only grease and oxide free objects can be coloured!

Good luck!

Goran Budija
- Cerovski vrh Croatia
2005

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