Cosmic cobalt (#2E2D88) and Rust (#B7410E) appear together across 3 master palettes in our corpus, most prominently in the work of Andre Derain and the Post-Impressionism tradition. Painters typically deployed cosmic cobalt at an average of 7% of the canvas, with rust at 3%. Third colors most often completing the combination include Black olive (#3B3C36), Gold Fusion (#85754E), and Satin sheen gold (#CBA135).