Dark sienna (#3C1414) and Rich black (#010203) appear together across 6 master palettes in our corpus, most prominently in the work of Vladimir Borovikovsky, Andrés Amaya, and Luis de Madrazo y Kuntz and the Rococo tradition. Painters typically deployed dark sienna at an average of 34% of the canvas, with rich black at 15%. Third colors most often completing the combination include Raisin black (#242124), Zinnwaldite brown (#2C1608), and Bistre (#3D2B1F).