What is Niello
什么是乌银
标签：乌银,硫化物,银合金,黑色装饰,金属填充
乌银（niello）是一种含硫、银、铜、铅的低熔点黑色合金，加热熔融后填入金属表面的阴刻纹样，冷却形成深邃的黑色装饰。它与珐琅不同，质感呈金属性而非玻璃质。
Niello is a low-melting black alloy of sulfur, silver, copper and lead that is fused into engraved recesses to create a deep black decoration. Unlike enamel, it has a metallic rather than glassy finish. ---