Is the Sode no Shirayuki blade actually clay-tempered?
Updated Mar 2026
Yes. The Sode no Shirayuki replica uses clay-tempered 1065 steel, which means a layer of clay is applied along the spine of the blade before the final heat treatment. This causes the edge to cool faster than the spine, producing a real hamon - the undulating temper line visible near the cutting edge. On the Sode no Shirayuki piece, this detail complements the all-white blade and saya presentation associated with Rukia Kuchiki's Zanpakuto. Clay tempering is a process associated with traditional Japanese bladesmithing, and its inclusion in a collectible replica reflects a meaningful step up in craft investment compared to replicas that simulate the hamon through acid etching alone.