Dark sienna (#3C1414) and Dark slate blue (#483D8B) appear together across 6 master palettes in our corpus, most prominently in the work of George Henry, Aleksandra Ekster, and Asgrimur Jonsson and the Impressionism tradition. Painters typically deployed dark sienna at an average of 10% of the canvas, with dark slate blue at 8%. Third colors most often completing the combination include Smoky black (#100C08), Dark purple (#301934), and Russian violet (#32174D).