About This Item
Shinden Yama Suita Japanese Natural Sharpening Stone 2040g (4lb. 8oz. )
210mm X 80mm X 46-50mm
#6000 to #8000 grit on for chisel blade or Japanese plane or high carbon knife Kasumi and Damascus pattern
It produces good amount of black slurry quickly, so it might not need Tomo Nagura or a devise that generates slurry.
(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)
Particle Size-------- 8.9
It makes my blue II steel blade Jigane became cloudy silver color, and Hagane became semi-mirror finish to mirror 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)
Japanese carpenters like to carry Suita to working site, because when their blades get dull the sharpeness, it can get back sharpness quickly. Natural whetstone cannot be compared with artificial whetstone hardness and particle size. Probably #6000 to #8000 or higher 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.