Bistre (#3D2B1F) and Onyx (#353839) appear together across 6 master palettes in our corpus, most prominently in the work of Alexandre-Louis Leloir, Filippo Palizzi, and William Hoare and the Academic Art tradition. Painters typically deployed bistre at an average of 25% of the canvas, with onyx at 10%. Third colors most often completing the combination include Eerie black (#1B1B1B), Smoky black (#100C08), and Coffee (#6F4E37).