Copper (#B87333) and Rifle green (#444C38) appear together across 6 master palettes in our corpus, most prominently in the work of Bernhard Strigel, Tarsila do Amaral, and Giovanni Francesco Romanelli and the Northern Renaissance tradition. Painters typically deployed copper at an average of 14% of the canvas, with rifle green at 7%. Third colors most often completing the combination include Eerie black (#1B1B1B), Bistre (#3D2B1F), and Gold Fusion (#85754E).