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Hatsukokuro Kurogane 120mm Ko-Bunka Iron Clad Aogami 2 Kurouchi Mono Ebony Handle

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Made for Hatsukokuro in the Tosa region of Shikoku Island in Japan with an iron clad aogami 2 carbon steel core with a mono octagonal ebony handle. These have the black kurouchi finish from the forge left on and are ground with a somewhat basic convex grind on the kireba bevels. 

Reasonably priced Tosa knives like these are characterized by good forging on good steel with minimal finish grinding keeping them affordable, in the rural market the handles are typically the least expensive plastic ferruled magnolia wood options, but we thought they deserved an upgrade on the handle. The convex bevel will have good food release and a little extra toughness being a hair thicker than a flat ground kireba but will need thinning after a dozen or so sharpenings to keep them moving through food smoothly. 

Please note, because of the affordable rustic nature of these knives finish, irregularities and minor imperfections are to be expected; slight irregular grinds, a tiny wavyness in the edge or stray scratches on face of blade. 

Hand forged knives from the Tosa area of Shikoku Island, Japan's least populated island with a long history of smithing. Shikoku's thick forests, agriculture and fisheries have led to a local style of smithing that is characterized by rustic free forged knives and tools. Many Tosa knives are ryoba style; forged and ground symmetrically and are suitable for both right and left hand users.

This is a reactive carbon steel. It should be mentioned that extra care is required, as the knife is not stainless and should be dried immediately after use. It will develop a dark patina with usage, but any orange rust should be removed with a light abrasive.

General Purpose

Good for veggies and boneless protein

Avoid Bones & Dense Foods

If you can't bite it, don't cut it.

Iron Clad Carbon

Reactive core steel between two reactive layers.

Wide Kireba Bevel

Smooth, robust cutting feel.

Ambidextrous

Suitable for all users.

Bunka

A bunka is a Japanese multipurpose kitchen knife known for its angular kiritsuke-style tip. Its flat edge profile excels at push-cutting and chopping, while the sharp, pointed tip provides precision for detail work and piercing tasks. Versatile and agile, the bunka covers everyday prep from vegetables to proteins with a bit more tip control than a standard santoku.

Listed Length: 120mm
Total Length: 247mm
Edge Length: 121mm
Heel Height: 42mm
Spine Thickness: 2.94mm
Weight:
Orientation: Ambidextrous

Blade Type: Carbon Steel
Steel Type: Aogami 2 (Blue Paper #2)
Steel Hardness (HRC): undisclosed
Reactive: Yes
Handle Type: Japanese (wa)
Handle Material: Ebony

  • This is a carbon steel knife made from thin, hard steel.
  • Hand wash and towel dry after use. Do not air dry or place in the dishwasher.
  • Expect oxidation (color change, staining, spotting) with use.
  • Prolonged exposure to moisture or food debris will cause rust; remove any rust with a light abrasive.
  • Remove surface rust gently with a mild abrasive and progress to more aggressive abrasives if needed. Coarse abrasives will leave scratches in most finishes.
  • Avoid twisting, scraping, or use on dense or hard foods and surfaces to avoid early dulling and edge damage. If you wouldn't bite into it, don't cut it with this knife.
  • Use on wooden cutting boards only. Do not use bamboo, plastic, stone or metal cutting surfaces.

Medium-fine finish

We recommend sharpening by hand using whetstones starting around 1000 grit progressing to at least 4000 for this steel type and edge geometry. Finish with a monodiachrome strop for a smooth cut with a substantial bite. Finer finishes are possible, but the knife may slide on smooth foods and overall edge retention may suffer. During repair, use a super coarse stone to pass chips quickly to help keep flat bevels.

  • Avoid pull-through sharpeners and non-water-cooled mechanized systems.
  • Strops and ceramic honing rods are preferred for as-needed edge maintenance. If you have to use a honing rod to be able to use the knife comfortably, it's time to sharpen the knife.

About Hatsukokoro


Hatsukokoro curates knives from skilled blacksmiths across Japan, bringing diverse regional styles under one name. “Hatsukokoro” means “First Heart,” reflecting a focus on foundational craftsmanship and quality. Instead of forging in-house, they partner with trusted makers to offer a wide variety of blades—each finished and sharpened to the brand’s high standards. Whether sourced from Tosa, Sakai, or Sanjo, Hatsukokoro knives emphasize thoughtful design, practical performance, and consistent quality. It’s a brand for cooks who appreciate variety, craftsmanship, and well-selected tools from across Japan’s knifemaking regions.

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