Unknown Kiita Nashiji Awasedo Fine Grit Japanese Natural Sharpening Stone 2lb. 1oz. (936g) 202mmX75mmX28mm
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#4000 to #6000 for medium range in the fine grit for high carbon blade
It is used, but it is in excellent condition. I do not know which mine it derived from, and it has beautiful Kiita with Nashiji on sharpening surface. It looks fast cut stone, and kind of soft stone, but it is not muddy stone.
It raises great amount of dark gray or light black color slurry. It is very smooth stone, and it does not need tomo nagura or the device to produce the slurry (worn Diamond lapping stone).
(Scale; 1 to 10, 1-3 is very soft muddy rough grit whetstone 3-6 is soft medium grit whetstone, 6-8 is hard medium grit whetstone; 8-10 is fine grit whetstone)
It makes my white II steel kasumi blade knife Hagane became bright silver color semi-mirror finish. Jigae became vivid frosted silver color finish.
(Scale; 1 to 10, 1-3 give deep scratch marks to the steel, 3-5 is delete the 1-3 scratches, 5-8 makes the steel cloudy, 8-10 makes the steel semi-mirror finish or mirror finish)
Natural whetstone has wider capacity than artificial whetstone, and actually, we do not know until sharpen blade on the hone for a while. Because artificial whetstone molecules do not break down to smaller sizes, but Natural whetstone molecules are possible to break down to smaller sizes, and those molecules are mixed with sharpened steel molecules, and make Jigane as suitable Jigane color, and Hagane as suitable Hagane color. It is natural mystics.