Dark slate gray (#2F4F4F) and Eerie black (#1B1B1B) appear together across 6 master palettes in our corpus, most prominently in the work of Hans Holbein the Elder, Jean-François Bosio, and Kmetty János and the Romanticism tradition. Painters typically deployed dark slate gray at an average of 25% of the canvas, with eerie black at 12%. Third colors most often completing the combination include Ebony (#555D50), Drab dark brown (#4A412A), and Bistre (#3D2B1F).