What is clay tempered katana?

Clay Tempered Katana are swords created using a specific blade reinforcement procedure, one of the most complex arts in sword-making techniques and the pinnacle of Japanese sword design.

Clay tempering is so named because the swordsmith will employ "clay" to insulate the blade's spine. Although each swordsmith has a unique list of secret ingredients, they often consist of clay, water, stone powder, rust, and maybe some ash. A thin clay coating is carefully applied along the cutting edge, while a thicker layer is applied to the body and spine. A pattern will be drawn in the clay, often appearing like an undulating wave flowing down the length of the blade. The differential hardening process allows the sword to acquire beautiful curves, and the heating-quenching process forms a distinctive natural temper line down the blade known as Hamon, which is typically observed as a frosted wavy line down the length of a polished sword blade.

Katanas that have been clay tempered are approved to be more robust and durable. The goal of clay tempering is to achieve hardness as well as flexibility, which is a flexible spine and a strong cutting edge. Harder steel sharpens better than softer steel, keeps its sharpness longer, and resists denting. The flexible spine allows the blade to withstand higher force without breaking. The combination of toughness and flexibility work together to create a great sword.

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