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Chemically coloring cold-rolled steel

What chemicals are used to produce blues, yellows, greens,reds, ect on cold-rolled steel. I am trying to create a unique look for some patio furniture I am building. Thank-you.

Scott Roberson
- Las Vegas , Nevada, U.S.A.
2003

Black for iron:2 gm tannic acid ⇦ this on eBay or Amazon [affil links] ,2gm tartaric acid ⇦ this on eBay or Amazon [affil links] ,1 lit water

Redish brown:15 gm iron chloride,1 lit water

Blue:50 gm copper nitrate ⇦ this on eBay or Amazon [affil links] ,50 gm manganese nitrate,1 lit water,temp. 50 °C

Green:1 part silver acetate, 20 parts oil of lavender.Must be applied with cloth and then heated to 150 °C

Good luck!

Goran Budija
- Cerovski vrh Croatia
2003

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