Firebrick (#B22222) and Raisin black (#242124) appear together across 6 master palettes in our corpus, most prominently in the work of Alberto Magnelli, Cagnaccio di San Pietro, and Sophie Taeuber-Arp and the Abstract Art tradition. Painters typically deployed firebrick at an average of 16% of the canvas, with raisin black at 11%. Third colors most often completing the combination include Khaki (#C3B091), Platinum (#E5E4E2), and Persian plum (#701C1C).