This stone is particularly appreciated by people who use polishing stones. It is quite soft, but produces little slurry and holds its shape reasonably well. Uchigumori are not the fastest stones, but the polishing results are truly exceptional. Without the magnifying glass, no obvious scratches will be visible on the blade surface. The hard-tempered steel will have a wonderful lustre and the shell should darken. While uchigumori may not reveal the fine grain structure of the steel as a finer, harder Suita might, the results are usually more predictable and easier to achieve. With a fully smoothed surface, they could be used to prefinish razors or tools, but they are best suited for polishing kitchen knives. They can also be used for sharpening and give a fairly aggressive cut.
The stones are reasonably clean and there are only a few lines that are unlikely to cause problems. The stone is grey with red dots called lotus blossoms. The latter are all over the stone and are in a dense pattern known as renge.
Almost the entire surface of the stones has been smoothed and prepared for work.
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