Bone (#E3DAC9) and Onyx (#353839) appear together across 6 master palettes in our corpus, most prominently in the work of Ossip Zadkine, Albert Edelfelt, and Bart van der Leck and the Expressionism tradition. Painters typically deployed bone at an average of 25% of the canvas, with onyx at 11%. Third colors most often completing the combination include Khaki (#C3B091), Eerie black (#1B1B1B), and Middle grey (#8B8680).