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Karajime (Cold forging)

After it cools down, the black taint is removed by grinding with a rough polishing stone, and the Hirachi (blade) and Shinogichi (ridge line) are hammered using a Kozuchi (light hammer), and cold forging process is applied. The straight lines of Mune and blade are adjusted, and unevenness is shaved with a special plane for shaving metal called Sen (銑, with the radical of 金 and 舌, by right). In this step, 'Hawatari (length of the blade) and the 'Machi (notch)' is determined.