Decorated metal

• Black ornamental work
• Engraving that is inspired by last of Jackson Pollock's three pivotal pieces
• Ornamental alloy
• Metallic alloy

Wikipedia Word definitions in Wikipedia
Niello is a black mixture of copper , silver , and lead sulphides, used as an inlay on engraved or etched metal. The Egyptians are credited with originating niello decoration, which spread throughout Europe during the late Iron Age and is common in Anglo-Saxon ...

Wiktionary Word definitions in Wiktionary
n. 1 Any of various black metal alloys, made of sulphur with copper, silver or lead, used to create decorative designs on other metals. 2 An impression on paper taken from the engraved or incised surface before the niello alloy has been inlaid.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Niello \Ni*el"lo\, n. [It. niello, LL. nigellum a black of blackish enamel, fr. L. nigellus, dim. of niger black. See Negro , and cf. Anneal .] A metallic alloy of a deep black color. The art, process, or method of decorating metal with incised designs ...