Thank you Marc. I was not aware of this.
Yannis, both are correct. Niello must be applied directly onto silver, but only in the recessed areas of the silver. Recessed areas are done by use of chasing, engraving, planishing, stamping, etc. Thus it will have more endurance over time as you suggest. As I mentioned, only the raised areas (those that stand out) will not be niello but exposed silver.
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