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The niello is , of course, of Caucasian origin, ie NE Anatolia.
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Besides the fact that Anatolia and Caucasus are adjacent but they aren’t the same region, niello is NOT of Caucasian origin:
http://concise.britannica.com/ebc/ar...9373477/niello
http://aic.stanford.edu/jaic/article...21-02-006.html