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Uchigumori Koppa

  • This is a large raw cut uchigumori stone.  These stones are often broken down into smaller pieces and used as finger stones.  They can also be used as is.  They generally do a very nice job leaving a beautiful kasumi finish.  They are muddy and medium hardness.  Traditionally, these kinds of stones are used in sword polishing.  The edge it leaves is in the 6-8k range.


    Natural stones from this region are rich in silica, which acts as a main abrasive. This regions' natural stones all have about the same fineness of girt to being with (around 6-8k) and the potential finish can go up from there, depending on the stone hardness, the pressure you use during sharpening, water, etc.


    This stone should be used like a splash and go stone... add just enough water to lubricate the surface, but not too much.  The goal is to develop mud, so keeping the surface very wet is prohibitive to mud development.

    • Grit Level: fine
    • Length: 230mm
    • Height: 40mm
    • Width: 140mm
    • Weight: 1855g

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