Firebrick (#B22222) and Rich black (#010203) appear together across 6 master palettes in our corpus, most prominently in the work of Anita Malfatti, John Hoppner, and Ivan Milev and the Modernismo tradition. Painters typically deployed firebrick at an average of 20% of the canvas, with rich black at 6%. Third colors most often completing the combination include Red-violet (#922B3E), Light steel blue (#B0C4DE), and Oxford blue (#002147).