Then the armorer, or cup and casket maker, added to this kind of decoration that of flat inlaid enamel; and the silver-worker, finding that the raised filigree (still a staple at Genoa) only attracted tarnish, or got crushed, early sought to decorate a surface which would bear external friction, with labyrinths of safe incision. From Wordnik.com. [Ariadne Florentina Six Lectures on Wood and Metal Engraving] Reference
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