Bistre (#3D2B1F) and Dark slate gray (#2F4F4F) appear together across 6 master palettes in our corpus, most prominently in the work of Hans Holbein the Elder, Albert Herter, and Maria Blanchard and the Gothic Art tradition. Painters typically deployed bistre at an average of 22% of the canvas, with dark slate gray at 10%. Third colors most often completing the combination include Eerie black (#1B1B1B), Smoky black (#100C08), and Pine green (#2A2F23).