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Hizukuri (Shaping with heat)

Mune (back) of the blade is struck to start the base of a triangular shape, and the blade side (Hirachi) is struck and elongated to reduce thickness. Then the Mune of the Nakago is struck to round the back edge, and lastly 'Shinogichi (ridge line)' is struck and formed. The whole body of the blade is heated at a lower temperature until it becomes reddish brown.