Onyx (#353839) and Umber (#635147) appear together across 6 master palettes in our corpus, most prominently in the work of El Lissitzky, Ernst Ludwig Kirchner, and Utagawa Kunisada and the Expressionism tradition. Painters typically deployed onyx at an average of 26% of the canvas, with umber at 16%. Third colors most often completing the combination include Eerie black (#1B1B1B), Shadow (#8A795D), and Khaki (#C3B091).