To decorate or inlay with niello.
用黑色合金装饰或镶嵌
In Russia niello work is known as Tula work.
在俄国，黑金镶嵌制品被称为图拉工艺品。
After the excess niello is scraped away, the surface is polished.
将多余的黑金刮掉, 再将表面抛光。
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