The Treet "Black Beauty" Carbon blade unique in several ways.
The bluing applied in manufacturing is a metallurgical process which provides a natural anti-oxidation coating. I think of it as "old-school" and something that Straight Razor shavers like me will appreciate. I like the bevel feel on the face that this blade offers which is just a little different than the typical high stainless and multi-coated modern blade. Be patient, willing to adjust your technique -- this blade is one of my smoothest blades and can provide a stellar BBS shave.
For me, I approach this blade much the way I would with a straight razor shave -- slow and methodical, the blade feels slightly different and more substantial-- responsive to technique!
I've never had rust issues with this blade, but I always clean my razors and "very gently" dab off extra moisture-- linen cloth towel not touching the bevel - avoid rubbing! Some wetshavers will simply let the blade air dry -- use your preferred method, but just use some basic care and you'll be fine with this blade.
This blade is unique and bitterly smooth when all things come together with face prep and technique. I find it outstanding and on my top-tier list. Nick Shaves has a good video on the Treet black carbon-- raves about his shave results yet offers realistic expectations.
Treet Yourself!
Mark
Seattle, WA
USA