Copper (#B87333) and International orange (#BA160C) appear together across 6 master palettes in our corpus, most prominently in the work of Theodore Poulakis, Stefan Luchian, and Giacomo Balla and the allegorical painting tradition. Painters typically deployed copper at an average of 22% of the canvas, with international orange at 10%. Third colors most often completing the combination include Smoky black (#100C08), Bistre (#3D2B1F), and Sunray (#E3AB57).