sil, Researching purple metals for a #DnD thing (or possibly a novel, although I can’t see where I get the time) and there are a few interesting possibilities. Purple bronze is probably a no-no (the various varieties of it have all sorts of mad stuff in the alloy like molybdenum, and I can’t see how you’d make it at that tech level) and Japanese shakudo is cool but the patina wears off with handling. But I may have found the answer in hepatizon, which nobody knows how to make any more. Cool.