Tsuiki Copperware: Planishing at Gyokusendo
日本锤起铜器与玉川堂的打平体系
标签：锤起铜器, 玉川堂, 日本工艺, 一块打, 非遗
新潟县燕市的锤起铜器以"一块打"著称，玉川堂自 1816 年起七代传习：锻延与打平交替数百轮，锤痕按木目状规律排布，壶壁可锤至 0.4–0.5 mm 而不裂，靠的是每 20–30 min 一次约 600 ℃ 的退火。该技艺 2016 年被认定为日本传统工艺品，锤纹走向即匠人签名。
Tsuiki copperware of Tsubame, Niigata, is famed for "one-block" forming: since 1816 Gyokusendo has passed the craft through seven generations, alternating raising and planishing over hundreds of rounds until walls thin to 0.4–0.5 mm without cracking, thanks to anneals at about 600 °C every 20–30 min. The wood-grain hammer layout is the maker's signature; the craft received Japanese traditional-craft designation in 2016. ---