Indigo dye (#00416A) and Raisin black (#242124) appear together across 6 master palettes in our corpus, most prominently in the work of Matthew Smith, Albrecht Altdorfer, and Karl Nordström and the Post-Impressionism tradition. Painters typically deployed indigo dye at an average of 26% of the canvas, with raisin black at 9%. Third colors most often completing the combination include Dark liver (#543D37), Steel blue (#4682B4), and Charcoal (#36454F).