The blade that has color was a piece of 1085 that a member of this board sent to me. The other blades are all files. Wick send me a good message back in the spring about heat treating and I use the method that he shared with me...nothing special, normalizing, quenching, and then I have a small oven that I set on 425 and heat for an hour then cool (X3) and I get the straw color that is needed.