Complete and premium quality 4 piece Mikawa Shiro Nagura Progression Set sourced from Sakamoto San. This set includes a large Botan with enough surface area to hone directly on. The Tenjou is a rare white Betsuju with excellent size. The Mejiro is large sized rare Tokyu piece. The Koma is a pure white Betsuju of excellent quality. This unique set represents some less commonly seen pieces in great size and quality. Together they make an excellent progression!
We have tested each nagura for quality, and carefully matched them for use in progression. In addition all sides except the rubbing surface have been coated with cashew lacquer to protect the nagura from water infiltration / deterioration over time.
Weights and notes:
Botan - 237g
Betsuju meaning White and irregular shaped. This large Botan has enough surface area on the backside to hone directly on.
Tenjou - 162g
Betsuju meaning White and irregular shaped.
Mejiro - 204g
Tokyu meaning Striped and irregular shaped.
Koma - 103
Betsuju meaning White and irregular shaped
Use:
Mikawa Nagura stones—Botan, Tenjou, and Mejiro—are natural Japanese honing stones used in progression to sharpen and polish blades with precision. These stones, mined in the Mikawa region, are highly valued for their ability to refine cutting edges, making them indispensable for straight razors, knives, and fine tools.
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Botan (Coarse Grit): The coarsest Nagura, Botan is used to remove scratches from previous sharpening stages and establish a foundational edge. Its thick slurry works efficiently to refine rough edges and prepare them for further polishing.
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Tenjou (Medium Grit): As a medium-grit Nagura, Tenjou transitions the sharpening process, smoothing the edge further after the Botan stage. It produces a finer slurry that reduces micro-serrations and prepares the blade for fine finishing.
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Mejiro (Fine Grit): Mejiro is a fine-grit Nagura used to refine the edge to near perfection. Its fine slurry creates a smooth and sharp edge, leaving the blade ready for ultra-fine finishing stones.
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Koma (Very Fine Grit): is a very fine Nagura whetstone, renowned for its ability to refine and polish edges to razor sharpness. "Koma" signifies its fine grade.
These stones are applied by rubbing them on a hard base whetstone to create a slurry, essential for the sharpening process. When used sequentially, Mikawa Nagura stones ensure a sharp, mirror-polished edge, combining tradition and functionality for exceptional results.
