Bistre (#3D2B1F) and Tourmaline (#86A1A9) appear together across 6 master palettes in our corpus, most prominently in the work of Adolf Pirsch, William Stanley Haseltine, and Jan Cossiers and the Realism tradition. Painters typically deployed bistre at an average of 21% of the canvas, with tourmaline at 11%. Third colors most often completing the combination include Eerie black (#1B1B1B), Khaki (#C3B091), and Drab dark brown (#4A412A).