Copper (#B87333) and Zinnwaldite brown (#2C1608) appear together across 6 master palettes in our corpus, most prominently in the work of Huygh Pietersz Voskuyl, Ginevra Cantofoli, and Léon Bazile Perrault and the Baroque tradition. Painters typically deployed copper at an average of 24% of the canvas, with zinnwaldite brown at 14%. Third colors most often completing the combination include Smoky black (#100C08), Café noir (#4B3621), and Seal brown (#59260B).