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.
冷えてから表面の黒い汚れを荒砥石で砥ぎ落とし、平地と鎬地を小槌で叩いて冷間加工を行なう。