Copper (#B87333) and Dark sienna (#3C1414) appear together across 6 master palettes in our corpus, most prominently in the work of Vincenzo Irolli, Georges Braque, and Wilhelm Leibl and the Realism tradition. Painters typically deployed copper at an average of 30% of the canvas, with dark sienna at 11%. Third colors most often completing the combination include Smoky black (#100C08), Seal brown (#59260B), and Eerie black (#1B1B1B).