Blue Steel #1 is similar to Blue Steel No.2, but the additional Carbon and Tungsten / Wolfram result in even better edge retention and toughness. The steel is perhaps most commonly seen in high-grade Japanese traditional single-bevel edged knives.

Traditional Kasumi polished finish. Kasumi roughly translated to “mist” or “cloud” and refers to the hazy appearance of the soft steel/iron cladding, in contrast to the fine polished cutting edge. This elegant finish is very common on traditional style Japanese blades.