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Noun: niello (niellos,nielli)  nee'e-low
  1. A metallic alloy of a deep black colour
  2. A piece of metal, or any other object, so decorated
  3. An impression on paper taken from the engraved or incised surface before the niello alloy has been inlaid
  4. The art, process, or method of decorating metal with incised designs filled with the black alloy

Derived forms: nielli, niellos

Encyclopedia: Niello