Bone (#E3DAC9) and Gunmetal (#2a3439) appear together across 6 master palettes in our corpus, most prominently in the work of Vaszary János, Bernard te Gempt, and Al-Jazari and the Romanticism tradition. Painters typically deployed bone at an average of 25% of the canvas, with gunmetal at 13%. Third colors most often completing the combination include Khaki (#C3B091), Umber (#635147), and Middle grey (#8B8680).