Dark sienna (#3C1414) and Russian violet (#32174D) appear together across 6 master palettes in our corpus, most prominently in the work of George Henry, and Natalia Goncharova and the Impressionism tradition. Painters typically deployed dark sienna at an average of 4% of the canvas, with russian violet at 3%. Third colors most often completing the combination include Zinnwaldite brown (#2C1608), Timberwolf (#DBD7D2), and Smoky black (#100C08).