The niello technique exists as any metalworking method or technique where black enamel is modified for opposition.
What exactly is the niello technique?
The niello technique is referred to as any technique of metalworking, and in that technique, black enamel is increased for the opposition.
It is referred to as a sulfur-containing metallic alloy that is applied as a surface ornament method. The luster of niello is metallic rather than vitreous, and it is tougher than enamel.
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