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How do I create a black patina on iron?

I have been working on an iron bench. I have just removed all of the red rust and now it is bright and silver. What chemicals or formulas should I use to give it a black patina?

Thanks.

Kate Rossiter
home artist - Carrollton, Texas, US
2004

You can use 20 gm tannic acid ⇦ on eBay or Amazon [affil link] /2o gm tartaric acid ⇦ on eBay or Amazon [affil link] / 1 lit water solution. You can paint it on your object(or spray or immerse object in solution). Instead tartaric acid ⇦ on eBay or Amazon [affil link] you can use phosphoric acid(15 gm). Wax, oil or lacquer finished object, Good luck!

Goran Budija
- Cerovski vrh Croatia
2004

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