temper pattern of a sword blade
Refers to the visible wavy or straight pattern along the edge of a Japanese sword blade, created during the differential hardening process. A technical term used in sword appreciation and craftsmanship.
The temper pattern of a Japanese sword is where the swordsmith's individuality shows.
この刀の刃文は美しい直刃だ。
The temper pattern on this sword is a beautiful straight line.
A compound of 刃 “blade” and 文 “pattern,” referring to the visible temper pattern produced along a Japanese sword’s edge.