Niello Gradients in Contemporary Jewellery
当代首饰中的乌银渐变应用
标签：渐变, 当代首饰, 乌银, 表面设计
当代首饰设计师用"局部熔合 + 分级硫化"做乌银渐变：先在银板局部錾浅槽熔入乌银条（750–780 ℃ 热风枪可控），再以 K2S 1%→3% 分三次蘸涂非熔合区，形成熔合乌银（哑光炭黑）→ 化学黑（深灰）→ 原银的三段或五段色阶。关键控制：每次蘸涂间隔用去离子水冲洗并吹干，温度过高会出现硫化膜起皮。渐变区最后以 0.3 μm 砂膏轻抛分界，视觉过渡自然。此技法在 2010 年代慕尼黑珠宝学院作品中广泛出现。
Contemporary jewellers build niello gradients by fusing locally, then grading chemically: fuse niello strip into shallow chased grooves (750–780 °C with a heat gun), then dip the rest in 1%→3% K2S in stages — fused charcoal-black, chemical dark grey, bright silver. Rinse and dry between dips to prevent flaking; blend boundaries with 0.3 μm abrasive. This layered approach became a signature of 2010s Munich Academy work. ---