Koyanagi Kurouchi 120 mm (4.7 in) Aogami (Blue) #2 Double-Bevel

• Type: Koyanagi
• Finish: Kurouchi 
• Blade Length: 120 mm (4.7 in)
• Construction: Hon-Warikomi
• Core Edge Steel: Aogami (Blue) #2
• HRC (Rockwell Hardness): 61-63
• Handle: Magnolia
• Bevel: Double-Bevel
• Place of Origin: Tosa, Japan

A slim double-bevel Yanagi-type knife for sashimi. Shorter ones (6–13.5 cm) make an excellent substitute for petty knives. 

Blue (Aogami) #2 (Hitachi Metals Ltd.) is made by adding Chromium and Tungsten / Wolfram to White Steel #2. This results in increased toughness and the production of hard carbide molecules, which improve edge retention. Many knife users have noted that while Blue Steel #2 is very similar to White Steel #2 in edge sharpness, it has slightly superior edge retention.