Katana Info Katana Guides & Knowledge Hub » hamon

The hamon is the distinctive temper line that runs along the edge of a katana, appearing as a beautiful wave, straight line, or intricate pattern on the blade. Formed during the traditional differential hardening process, the hamon marks the boundary between the sword's hardened cutting edge and its softer, more flexible spine. Beyond its striking appearance, the hamon serves as evidence of a blade's...