Before revision: It hardens and blackens when cool, and the niello on the flat surface is polished off to show the filled lines in black, contrasting with the polished metal (usually silver) around it.Levinson, 528; Craddock It may also be used with other metalworking techniques to cover larger areas, as seen in the sky in the diptych illustrated here.
After revision: It hardens and blackens when cool, and the niello on the flat surface is polished off to show the filled lines in black, contrasting with the polished metal around it.Levinson, 528; Craddock It may also be used with other metalworking techniques to cover larger areas, as seen in the sky in the diptych illustrated here.