Despite its size, this koppa is a fine example of a Japanese sharpening finishing stone from Maruo. It is not too hard, not too fine and suitable for various applications. It will finish sharpening on kitchen knives and serve as a finisher for tools and razors. This size is perfect for razors, but can also be used for polishing kitchen knives, even large ones. Still, it wouldn't be my first size choice for tools or knives.
No lines or inclusions to worry about. This stone is sealed.
Maruo (丸尾山, Maruoyama)
One of the few Japanese finishing stone mines still in operation. this Western mine is famous for its soft shiro suita. This mine is also well regarded for its shiki uchigumori (tenjyou suita), ao suita and aisa layer stones. Once widely available and relatively cheap, increased demand has outstripped supply, making these stones harder to come by and now considerably more expensive than they were a few years ago. However, considering all the advantages, they are quite affordable.
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