What is the hamon line on a T10 sword?
The hamon is the visible wavy line running along the blade, created through traditional clay tempering (tsuchioki). During forging, a clay mixture is applied in varying thicknesses along the blade — thicker on the spine, thinner along the edge. When the blade is heated and quenched, the differential cooling creates two hardness zones. The boundary between these zones is the hamon line. On T10 steel, this hamon is real and permanent — it is a physical result of the heat treatment process, not an etched or painted decoration. Each T10 blade's hamon pattern is unique.












