日本刀 (Nihonto)
Nihonto (日本刀 — Japanese sword) making is one of the world's most technically demanding metalworking traditions — producing the Japanese sword from tamahagane (玉鋼 — jewel steel) made by smelting iron sand (砂鉄 satetsu) in a traditional clay furnace (tatara) for 72 continuous hours. The defining technical achievement is the differential hardening process (土置き tsuchidoki): clay is applied in specific patterns to the blade before the final quenching — thicker clay over the spine (保護 protection from sudden cooling) and thinner or no clay over the cutting edge (allowing rapid cooling to produce the hard martensite of the hagane cutting zone). The boundary between hard edge and soft spine produces the visible hamon (刃文 — temper line) — the wave-pattern boundary that is the sword's aesthetic and structural signature. The clay pattern (tsuchidoki) is each swordsmith's secret formula.
Risk level: Endangered · Japan national Important Intangible Cultural Property (swordsmithing techniques)
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