Just thought I'd throw this out there. LionSteel KUR in Sleipner. The blade got the occasional rust from living in the sweaty south eastern USA, so I needed a better solution than just keeping it oiled all the time. I decided to see if I could get a patina out of the low chrome steel, so I disassembled the knife, and polished the blade to a mirror shine using Flitz and steel wool. I cleaned it off with rubbing alcohol, and then dipped the whole blade in a glass of hot apple cider vinegar for 30 minutes. Usually this method will turn a carbon steel blade with little to no chrome in the composition to a dark blue/tan and be more rust resistant. On the Sleipner steel it came out with a very "slight" color change to a light blue/tan and now shows a textured pattern. You can see the color change if you compare the silvered stropped edge to rest of the patinaed blade. Kinda hard to see in the picture unless you get the lighting just right. So far the patina has prevented the steel from staining after cutting up food and various woods. No rust yet, but I haven't pushed it in corrosive scenarios like a sweaty pocket just yet. Oil/CLP and steel wool will not remove the patina, so it is fairly durable.
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