About This Item
Unknown Shiro Suita Fine Grit Japanese Natural Sharpening Stone 3lb. 1.9oz. (1415.2g)
I guess it is old days excellent stone. Tokujyohin stamp on it which means superb product in Japanese. Great Shiro suita for sharpening knife is soft and not scratchy and black slurry quickly raised. It is the one.
#4000 to #6000 for final sharpening high quality cooking knife. It makes Jigane frosty and Hagane to slightly shiny but not mirror finish.
I do not know which mine it derived from, but I guess it might be Okunomon, or Ohira or, Okudo, or one of the east sides of the mine in Kyoto.
It raises very good amount of black slurry quickly. It is soft side in the fine grit stone. It is easy to sharpen and fun to sharpen. It looks that it does not need tomo nagura or the device to raise 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 finish blade knife Hagane became from dull to little shiny silver color. Jigae became frosted gray 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)
Probably #4000 to #6000 grit with the same as artificial whetstone. 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.