The Shun Blue series are truly unique. The carbon core of the Shun Blue is Hitachi blue carbon steel clad in stainless steel. A pure carbon steel knife will patina, and with this design, it creates a beautiful combination of high polished stainless steel contrasting against the exposed core. You may expect the edge to take on a bluish hue. Like any carbon steel knife, each Shun Blue knife should be dried thoroughly after each use. This is a nice selection of traditional Japanese shape, crowned by the Kiritsuke, a knife may be used to perform any task.