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Yu Kurosaki 's elegance shines through in a blade with fireworks-like sparkles!
13-cm blade with a San Mai construction—top layers made of stainless steel
Core made of Japanese Aogami Super steel with approximately 1.5% carbon
Rockwell hardness: 65 HRC - Excellent edge retention
Delicate hammered finish reminiscent of fireworks
Rosewood handle: lightweight and well-balanced
Black pakkawood guard— octagonal shape
Handcrafted by Yu Kurosaki in Japan
Limited stock
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Hand-forged in Japan, this Yu Kurosaki Kokusen AS all-purpose Japanese knife combines high-performance carbon steel with a hammered finish inspired by fireworks. Its 13-cm length is ideal for precise cutting of fruits, vegetables, herbs, cheeses, and small pieces of meat. Its San Mai construction, natural wood handle, and dark bolster come together to create a knife that is both technically sophisticated and uniquely distinctive. Each knife features slight variations due to the artisanal craftsmanship and materials used.
The 13-cm blade features a San Mai construction, consisting of a hard steel core surrounded by two outer layers of softer stainless steel. This design concentrates the blade’s cutting qualities in the core, while limiting the blade’s exposure to impact and corrosion along the sides.
The core of the blade is made of Japanese Aogami Super steel, a so-called carbon steel containing approximately 1.5% carbon. Such a high carbon content results in a fine, exceptionally durable edge. Its hardness of 65 HRC promotes excellent edge retention, along with the ability to be sharpened precisely on a whetstone. However, this steel requires regular care, as the core can oxidize if left damp.
The blade features a flat grind that provides a consistent geometry suited for everyday cutting tasks. The Kokusen line, which translates to “black brilliance, ” combines a blade with a slightly dark sheen with a delicate hammered finish reminiscent of fireworks. This aesthetic highlights the contrast between the Aogami Super steel and the stainless steel layers.
The handle is made of rosewood, a natural material whose shades and grain vary from piece to piece. This characteristic gives each knife a unique appearance. The wood also provides a pleasant feel and a warm sensation in the hand.
The black pakkawood bolster creates a subtle transition between the blade and the handle. This composite material, made from wood and resin, offers good stability against changes in humidity. Its appearance may vary slightly from one knife to another.
The octagonal shape makes it easy to position your fingers and is suitable for both right- and left-handed users. It provides multiple contact points to adjust your grip depending on the level of precision required. This compact design facilitates controlled movements during meticulous food preparation.
Wash the blade by hand with a soft sponge, then dry it immediately with a clean cloth. Since the Aogami Super core is sensitive to moisture, avoid soaking it and never let the knife air-dry. Do not put it in the dishwasher.
Use a wooden or soft-surface cutting board, and avoid cutting bones, frozen foods, or very hard items. To maintain the 65 HRC edge, use a sharpening stone suitable for highly hardened steels. A thin layer of food-grade oil may be applied before prolonged storage.
Yu Kurosaki is a Japanese blacksmith based in Echizen, in Fukui Prefecture. He began his apprenticeship as a blacksmith in 2002 before establishing his own workshop in 2014, in the heart of the famous Takefu Knife Village, a region of Japan renowned for its blacksmithing tradition.
His knives are produced in small batches and combine traditional techniques with contemporary finishes. Yu Kurosaki works with several types of Japanese steel, including Aogami Super, VG10, and SG2. His blades are prized for their hammered patterns, unique designs, and handcrafted construction.
The Kokusen AS line features an Aogami Super core with a stainless steel cladding. Its delicate hammered finish visually evokes shimmering sparks, while the natural wood handles enhance the artisanal character of each piece.
Discover Yu Kurosaki’s Kokusen AS knives on our website!
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