#750 Nakayama huge thick koppa tomae This koppa is perfect for chisels or as a pre-finishing stone for plane blades. Probably from either the shallower Akapin or the Tenjyo layer it will readily absorb water and will lightly self slurry with clear water and the stone will leave hard steel with a bright chrome finish and a distinct contrast between the hard hagane steel and the softer jigane wrought iron. If you use it with a slurry the cutting speed is increased and the steel will be less shiny while the softer wrought iron will look hazy. Using european mono steel blades on this stone will provide the same results to the hard steel. Lots of real estate on this stone, the color is tan and this is not an actual kiita stone. The kawa skin on all four sides shows distinct Nakayama characteristics including areas of sparkling black mineral components. There are also 2 small spots of cream colored namazu where these alternate water borne minerals have filled in inclusions that are straight and also an indicator of a Nakayama mined stone. The stone (toishi) has been lapped perfectly flat and the corners and edges beveled unless otherwise noted.  All of my stones come with a tested and appropriately sized tomonaguara slurry stone, and a money back guarantee minus the return shipping.

Hardness                   9

Grit Fineness              9+

Speed/Cutting           8++ to 9+ with slurry