Bistre (#3D2B1F) and Little boy blue (#6CA0DC) appear together across 6 master palettes in our corpus, most prominently in the work of Vincenzo Cabianca, Leopold Kupelwieser, and Charles Laval and the Realism tradition. Painters typically deployed bistre at an average of 20% of the canvas, with little boy blue at 4%. Third colors most often completing the combination include Khaki (#C3B091), Camel (#C19A6B), and Bone (#E3DAC9).