The model I posted in the photo came finished with a rather coarse satin finish. I took it to my belt grinder with a worn 600 grit belt and gave it several passes. Then on to a sisal buff wheel and to a sewn cotton wheel loaded with the dark chromium oxide and the later with green paste. This work refined the blades surface giving it more of a polished look. Which helps it slide during cutting and materials cut adhere less to the blades face. This also helps with the blades abilities to resist staining. Then I had to go back and sharpen it. Steels containing vanadium are very difficult to mirror polish. So, it's not easy. As Tiguy said, coatings are very hard and a costly mfg. step. Still, this option boots the blades performance when no coating is applied. Hope this helps. DM