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Dark blue patination for steel counter

I'm a student of metal design. I'm currently working on a bar counter for a friend of mine. It is made from sheet steel and he would like a dark blue colour on it. Any suggestions?

Orla O Grady
student - Oberstown, Ardee, Ireland
2004

You can use 50 gms copper nitrate [affil links]/50 gms manganese nitrate(up to 75 gms)/1 lit water solution.Working temp.5o C.

Good luck!

Goran Budija
- Cerovski vrh Croatia
2004

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