What is a hamon, and which blades in this collection have a real one?
Updated Mar 2026
A hamon is the temper line that forms along a blade during the clay-tempering process. A swordsmith applies a clay slurry to the blade before quenching — the thinner-coated edge cools faster, producing a harder edge, while the clay-insulated spine cools more slowly and stays tougher. The boundary between these two zones becomes visible as a distinct wavy or irregular line running along the lower portion of the blade. A real hamon is genuinely formed by this heat-treatment process and will shift in appearance depending on lighting angle. Blades described as having a "real hamon" or "clay-tempered hamon" in this collection — particularly those in 1065 carbon steel, Damascus, and folded steel variants — carry this authentic feature. Blades described with a "hamon blade" without the clay-temper qualifier may have a polished or acid-etched visual effect rather than a metallurgical one.