Santoku - Aibocho - Kurouchi Stainless
Aibocho (藍包丁) means literally "indigo knife" and represents two distinct Japanese craft traditions - Sakai's six centuries of blade-making and Tokushima's ancient indigo dyeing practices. This special edition all-purpose kitchen knife is both practical and beautiful.
Two crafts combined
Indigo (ai, 藍) has been woven into Japanese daily life for centuries - worn as workwear for its perceived antibacterial and insect-repellent properties, used to dress wounds, brewed as medicinal tea. The light-to-dark gradient on the Aibocho handle is the same indigo used for clothes dyeing in Tokushima, applied here to Hiba wood and sealed with a food-safe waterproof coating that prevents bleed.
The blade comes from Sakai, Osaka - one of Japan's foremost cutlery production centres, with a tradition of professional knife-making stretching back over 600 years, supplying the country's professional kitchens and cooking schools. The craftsman responsible for the Aibocho blades has spent a career making knives for chefs and culinary institutions.
These two craft traditions are applied here to a santoku - (三徳, "three virtues") - Japan's most versatile kitchen knife, designed for meat, fish, and vegetables alike. Its wide, flat blade profile makes it particularly effective for vegetables - the blade remains in contact with the board through the full stroke, producing clean, even cuts. It is the natural first knife for most home cooks, and the most used knife in most kitchens.
Blade finishing
The hammer marks (tsuchime, 槌目) across the blade face are struck by hand. Beyond their visual texture, they create small air pockets between blade and food, reducing the suction that causes soft ingredients to stick to the flat of the knife.
Kurouchi (黒打) is a traditional finishing technique dating to the Edo period, in which the blade's surface is left unpolished after forging, retaining the dark iron oxide layer produced in the fire. It is characteristically associated with carbon steel, because the oxide forms naturally and readily on iron-rich steel during the forging process. Achieving the same result on stainless steel requires a fundamentally different approach and represents a genuine technical breakthrough by the blacksmith. The Aibocho Kurouchi Stainless series offers a knife with the visual character and forged authenticity of traditional kurouchi, with the rust-resistance and low-maintenance practicality of stainless steel.
Specifications
- Steel: Stainless (SUS), kurouchi finish with tsuchime hammer marks
- Blade length: 18cm
- Grind: Double bevel (suitable for both hands)
- Handle: Hiba wood (hibaki, Japanese cedar relative), indigo-dyed, food-safe waterproof coating
- Origin: Made in Japan - blade from Sakai, Osaka; handle from Tokushima
Care instructions
Hand wash with mild neutral detergent, rinse, and dry immediately. Do not use a dishwasher. Do not twist the blade, or cut hard or frozen foods - the blade may chip. Do not expose the blade to open flame. The waterproof coating on the handle is durable but may flake under heavy impact - treat the handle with care. Minor variation in grain and indigo tone between individual knives is natural.
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EDIT JAPAN was founded in 2015 by Akiyuki Sakamoto in Saitama, Japan, beginning online sales of Japanese knives in 2016. In 2017 the studio launched its first original brand - 藍包丁 (Aibocho, the Indigo Knife) - a craftsman collaboration combining the blade-making tradition of Sakai, Osaka with the indigo-dyeing craft of Tokushima. The Aibocho is built on a simple premise: that a knife can carry the heritage of two entirely different regional traditions simultaneously, and that doing so creates something more than either could achieve alone. The series has been featured on Japanese television and in design media, and the indigo-dyed handle series has at times carried a two-year waiting list. Edit Japan continues to develop new collaborations across Japanese craft traditions.