Before I even opened this thread I knew by the title that there would be an interesting patina develop on the brushed 01. Some people like it, some don't. Hell, some people don't even understand what happens during the process. I've had people that don't understand the qualities of good steel and think that it's ruined because of the color change. It's really part of the reason that I put an etchant on a lot of my blades, but as a person that understands what's happening, I think it's fascinating. As a matter of fact, I encourage a lot of my customers to experience the "personality" of their knife by letting it's own patterns expose themselves through use.
Not so long ago, some of you may remember the knife that I made that came in second in KFU's knifemaker's challenge at Ethan Becker's house. That knife is my personal knife. Anyway, I've used it quite a bit, it needed a little touch up on the edge. My Dad was over one day, he picked it up to inspect it and I told him if he wanted he could take it home and sharpen it up, (my Dad is a master at razor sharp edges). He took me up on the offer and brought it back to me beyond razor sharp,but it looked brand new. Most people wouldn't have a problem with this, but I was excited about the patina it was developing and the story it was starting to tell. I didn't say anything to Dad, he is a fine craftsman in his own right and he was only doing what he thought was right, but I was kinda bummed that he cleaned the blade.