Definition of “niello”
noun:
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Any of various black metal alloys, made of sulphur with copper, silver or lead, used to create decorative designs on other metals.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Any of various black metal alloys, made of sulphur with copper, silver or lead, used to create decorative designs on other metals.
from Wiktionary, Creative Commons Attribution/Share-Alike License