Bone (#E3DAC9) and Ruby red (#9B111E) appear together across 6 master palettes in our corpus, most prominently in the work of Charles Demuth, Ustad Mansur, and Léo Schnug and the Precisionism tradition. Painters typically deployed bone at an average of 21% of the canvas, with ruby red at 5%. Third colors most often completing the combination include Tan (#D2B48C), Raisin black (#242124), and Khaki (#C3B091).