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Komon

UCHIGUMORI

UCHIGUMORI

No.260901-UCHI4
Regular price ¥90,000 JPY
Regular price Sale price ¥90,000 JPY
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Available From: October 01, 2026 12:00 (JST)

AREA : Kyoto

MINE : MIZUKIHARA

LAYER : UCHIGUMORI

REFERENCE GRIT : 4K-6K+

SIZE : W 75 mm, L198.5mm, H25.5mm

INTERPRETATION OF THE STONE

A medium Uchigumori Hato on the harder side, with very fast cutting speed and polishing power 
In the 4k-6k + range. 

This type of Mizukihara Uchigumori is a staple in my polishing progressions, very strong cutting speed that easily removes scratches from lower grit naturals like Mikawa Nagura or stones of similar grit range, preparing the final polishing work of the stones. 

Making the soft iron white bringing up details and color, leaving the hardened steel a fuzzy mirror finish. Depending on how it’s used could work as a final polishing stone or pre finishing stone. 

Tested on Tamahagane, Genkai white 1 Honyaki, standard soft Sanmai white 1 from Sakai and Nantetsu. The stone performed well across all steel but i felt pairs perfectly Tamahagane Honyaki and modern carbon steel Honyaki best as well as wrought iron. 

The stone has a few lines of rust that need to be dug out for fine polishing, this is a common practice among polishers and does not detract from the stone performance.


RECOMMENDED USE FOR :

Fine polishing for Tamahagane, soft iron, wrought iron, Honyaki and similar forging and steel types

MATERIAL
☑︎ Carbon Steel
☑︎ Tamahagane
☑︎ Wrought Iron
☑︎ Watetsu & Soft Iron Cladding
FORGING STYLE
☑︎ Honyaki
☑︎ Sanmai
☑︎ Damascus
BLADE TYPE
☑︎ Double Bevel Knife
☑︎ Single Bevel Knife
◻︎ Woodworking Tool
PROCESS
☑︎ Kasumi Finish (Polishing)
☑︎ Fine Detail Finish (Polishing)
◻︎ Edge Sharpening
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Prepared for Use

Komon does more than simply select workable natural stones.
Even the finest natural stone cannot be used for sharpening straight from the mountain. Each stone must be carefully prepared and finished before it is ready for use.

At Komon, each stone is carefully prepared and finished by craftsmen with extensive experience and knowledge of natural stones, so that its qualities can be experienced from the moment it is put to use.

  • A STABLE BASE

    We carefully flatten the back side to ensure stability during sharpening. When additional support is needed, we attach a wooden base to create a secure foundation.

    Any wobbling of the stone affects the precision of the sharpening process; stability is particularly crucial during final polishing and edge sharpening.

  • A READY-TO-SHARPEN SURFACE

    The sharpening surface is flattened and prepared for use.
    Softer stones intended for polishing and finishing are given generously rounded edges. Harder stones used for edge sharpening are also carefully rounded to prevent the stone from damaging the blade.

    As a natural stone is used, new layers of stone will gradually appear. Regular flattening and maintenance are therefore essential to keep the stone performing at its best.

  • PROTECTING THE STONE FOR YEARS TO COME

    Natural stones are formed by nature, and some may contain weaknesses that could eventually develop into cracks.
    We identify these stones in advance and, when necessary, reinforce the surrounding areas with cashew resin to help prevent future damage.

    Cashew resin can scratch a blade. Before use, any exposed cashew resin on the corner should be carefully rounded with a medium grit diamond plate.

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