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Mikawa Koma Nagura・Traditional Japanese Nagura for Razor Finishing #2
Mikawa Koma Nagura・Traditional Japanese Nagura for Razor Finishing #2
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Authentic Mikawa Koma nagura, traditionally used in the final stages of Japanese razor honing. Produces a very fine, smooth slurry ideal for edge refinement before water-only finishing or before Tomo naguras.
Full Description
Full Description
This Mikawa Koma nagura is a traditional Japanese nagura stone used in the final refinement stages of razor honing.
Koma is the finest of the classic Mikawa nagura and is traditionally used after Tenjō and Mejiro, directly before water-only or tomo finishing. It produces a very fine, smooth slurry that refines the edge while preserving sharpness and stability—qualities essential for straight razors and kamisori.
Sourced from the historic Mikawa region, long regarded as the classic origin of high-quality nagura, Koma is valued for its ability to soften and unify the edge without introducing harshness. The stone shown bears traditional markings and inspection stamps consistent with carefully selected Mikawa nagura.
When used on awasedo and other Japanese natural finishing stones, Koma helps to:
• Further refine the edge before final finishing
• Smooth and unify the cutting edge
• Improve comfort and control in the final honing stages
Recommended use
• Raise a light slurry on a Japanese natural finishing stone
• Use very light pressure and gradual dilution
• Follow with water-only finishing or a fine tomo nagura
As with all natural stones, each Mikawa Koma nagura varies slightly in feel and performance. There is no synthetic grit rating—results depend on technique, slurry management, and stone pairing.
A classic finishing nagura for traditional Japanese razor honing.
Materials
Materials
Natural Mikawa Nagura Whetstone - Koma
Measurements
Measurements
Length: 4.5cm
Width: 3.1cm
Height: 5.1cm
Weight: 104g
Hardness: 1 soft
Care Guide
Care Guide
Japanese nagura stones are precision tools used to condition sharpening stones and refine edges. Proper care ensures consistent slurry performance and long service life.
1. Keep the Working Face True
Only the working face of the nagura—the surface used to raise slurry—needs to be kept flat. Over time, this surface may become uneven or glazed, which can affect slurry consistency. If needed, lightly lap the working face on a fine diamond plate or flattening stone, removing as little material as possible.
2. Use with Water Only
Nagura stones are designed for use with clean water. Lightly wet both the nagura and the base stone before use. Do not use oil, soaps, or chemical additives.
3. Controlled Slurry Generation
Use light, even pressure when raising slurry. Slurry density can be adjusted through pressure and dilution. Avoid excessive force, which can reduce control and consistency.
4. Clean After Use
Rinse the nagura thoroughly after each use to remove metal particles and residue. A soft brush may be used if needed. Do not use detergents or abrasive cleaners.
5. Dry Slowly and Naturally
Allow the nagura to air dry completely in a shaded, well-ventilated area. Avoid direct sunlight, heat sources, or rapid temperature changes.
6. Store Separately
Store nagura stones in a dry, stable environment and away from heavier stones to prevent impact damage. Ensure the stone is fully dry before long-term storage.
7. Inspect Before Use
Before each use, rinse the nagura and ensure it is free from grit or debris. Any contamination may scratch the base stone or blade.
By following these guidelines, your nagura stone will provide predictable slurry behavior and remain a reliable part of traditional Japanese sharpening.
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