Nielli (objects decorated with niello) were produced in ancient Rome and 9th-century EnglanD. In Russia niello work is known as Tula work.
黑金制品（带黑金镶嵌装饰的物品）由古罗马人和9世纪的英国人制造。在俄国黑金镶嵌制品称为图拉工艺品。
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Niello: Black metallic alloy of sulfur with silver, copper, or lead, used to fill designs that have been engraved on the surface of a metal object, usually of silver.