Binsui is sandstone. The closest relative of the Amakusa, but denser and in most cases much thinner. In this case, the stone is attributed by the manufacturer as 2000 Japanese grits. What was indicated both on the stone itself and on the packaging.
The stone works with water, with auto-suspension and suspensions of other stones.
One of the strengths is that it does not get salted or clogged with sludge at all. Everything just rinses off with water.
The metal removal rate is easily controlled by the degree of pressure. And the subtlety of work can be adjusted by the amount of suspension and its crushing.
The stone is practical in work and not particularly whimsical for storage.
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