so beautiful colors!i can make green and black . how can i do the other ? its difficult ikonw .

The above photo comes from a great book for coloring bronzes and copper. The book "The Colouring, Bronzing and Patination of Metals (Hardcover)" can be purchased at Amazon by following this link. I wish we could get natural patinas like this from steel, but I have yet to find anything other than a copper, rust, or black patinas for steel.