Composition of Katana

katana blood groove
Hi is a blood groove carved into the surface of the blade, usually extending the entire length of the blade, parallel to the back. The ends of the blood grooves may have a modified shape, or they may simply be carved into the unsharpened nakago without modification.
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“Sori”-the radian of the blade
Sori refers to the radian characteristics of the blade, and the blade with different radians can be customized to the forging cutter according to user preferences. Different factions of forging cutters also have their own characteristics in making blade radians.
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nakaho
Nakago refers to the part below the blade and attached to the hilt, which contains rich information in the identification of Japanese swords and is no less important than the blade.
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