Before revision: Diptych with Nativity and Adoration, silver and niello, gilt-bronze frame, Paris, c. 1500, The Cloisters Byzantine gold ring with niello inscription "Lord help Leontius, Patrician and Count of imperial Obsikion guarded by God", c. 1000 AD Niello URL is a black mixture, usually of sulphur, copper, silver, and lead,Ingredients vary; see below used as an inlay on engraved or etched metal, especially silver.
After revision: Diptych with Nativity and Adoration, silver and niello, gilt-bronze frame, Paris, c. 1500, The Cloisters Byzantine gold ring with niello inscription "Lord help Leontius, Patrician and Count of imperial Obsikion guarded by God", c. 1000 AD Niello is a black mixture, usually of sulphur, copper, silver, and lead,Ingredients vary; see below used as an inlay on engraved or etched metal, especially silver.