Bone (#E3DAC9) and Sonic silver (#757575) appear together across 6 master palettes in our corpus, most prominently in the work of Filippino Lippi, Émile Bayard, and Piet Mondrian and the bijinga tradition. Painters typically deployed bone at an average of 31% of the canvas, with sonic silver at 10%. Third colors most often completing the combination include Khaki (#C3B091), Quick Silver (#A6A6A6), and Shadow (#8A795D).