These tools are made of high carbon steel and are not stainless (except our S.A.R. model). It is normal for the no-glare finish to wear with use, taking on an antique appearance. This process can be hastened by lightly buffing the steel surface with #0000 steel wool.
Clean and oil after each use. Sharpen with natural or diamond stones, then strop with belt leather or hard cardboard. Power sharpening is not recommended.