What is a hamon, and which blades in this collection show one?
Updated Mar 2026
A hamon is the temper line that forms along a blade's edge during the clay-tempering process. A swordsmith applies a layer of clay to the spine before quenching, causing the edge and spine to cool at different rates. The boundary between the harder edge steel and the softer spine steel becomes visible as a misty, undulating line - the hamon. Among the pieces in this collection, the T10 clay-tempered Shin Gunto replicas display a genuine, activity-rich hamon. Damascus blades show surface grain patterns that can resemble a hamon to the untrained eye, but the two are distinct phenomena. Collectors seeking authentic temper-line activity should look specifically at the T10 offerings.