Dark slate blue (#483D8B) and Indian red (#CD5C5C) appear together across 6 master palettes in our corpus, most prominently in the work of Camille Bombois, Aleksandra Ekster, and Charles Demuth and the Naïve Art (Primitivism) tradition. Painters typically deployed dark slate blue at an average of 6% of the canvas, with indian red at 4%. Third colors most often completing the combination include Dark sienna (#3C1414), Old lavender (#796878), and Platinum (#E5E4E2).