Japan — katana-making traditions applied to kitchen knives; Sakai city (Osaka) and Seki city (Gifu) as modern Japanese knife production centers
Japanese knives — whether double-bevel Western-style gyuto or single-bevel traditional yanagiba — require specific maintenance protocols distinct from European knife care. Japanese steel is typically harder (HRC 60–67 vs European HRC 56–58), allowing thinner, sharper edges but making the steel more brittle and prone to micro-chipping. Maintenance involves: daily honing before use with a ceramic or felt honing rod (never ridged steel rods, which damage Japanese edges), regular sharpening on whetstones at the correct angle (typically 10–15 degrees per side for double-bevel, 10–12 degrees on the flat face for single-bevel), proper drying and storage to prevent rust on high-carbon (hagane) steel knives.
Functional — precise knife geometry directly affects texture of cuts, which affects surface exposure, sauce absorption, and the sensory experience of eating
Never put Japanese knives in the dishwasher — the heat, caustic detergent, and vibration damage the edge geometry and accelerate corrosion. Dry immediately after washing. High-carbon steel (white steel/shiroko or blue steel/aoko) must be wiped dry within seconds of contact with acidic foods. Storage: on a magnetic strip or in a knife block with the edge facing up; avoid loose drawer storage. Honing rod: use soft ceramic or leather strop rather than grooved steel. Whetstone sharpening: always finish on a 3000-6000 grit finishing stone and strop on a leather strop.
Learn to test sharpness properly: the fingernail test (edge should catch rather than slide), paper test (clean slice without tearing), and tomato test (slices without pressure). A correctly maintained yanagiba should slice raw fish paper-thin in a single drawing motion with zero pressure. Apply camellia oil (tsubaki oil) to high-carbon steel after cleaning — it is the traditional Japanese blade oil and does not become rancid. Visit a professional togishi (knife sharpener) annually for geometric restoration.
Using a ridged European honing steel on Japanese knives — the aggressive ridges chip rather than realign the fine Japanese edge geometry. Sharpening at European angles (20+ degrees) on single-bevel knives designed for 10 degrees. Using a cutting board harder than the knife steel: glass, ceramic, and marble boards chip edges immediately. Neglecting to flatten whetstones — a dished whetstone cannot produce a flat edge bevel. Storing carbon steel knives without oil in humid environments.
Tsuji, Shizuo — Japanese Cooking: A Simple Art; Knife Merchant guild documents; Yoshihiro Knives training materials