Bistre (#3D2B1F) and Cambridge blue (#A3C1AD) appear together across 6 master palettes in our corpus, most prominently in the work of Bernabé de Ayala, Alonzo Cano, and Edwin Lord Weeks and the Baroque tradition. Painters typically deployed bistre at an average of 13% of the canvas, with cambridge blue at 9%. Third colors most often completing the combination include Smoky black (#100C08), Khaki (#C3B091), and Bronze (#CD7F32).