She used 9-inch by 12-inch black Strathmore Artagain 160 gsm paper, a white Conte crayon, a pastel pencil, a black Derwent watercolor pencil, black charcoal, a black oil pencil, a 3/16 ...

Robert Longo, Untitled (Riot Cops), 2016; Charcoal on mounted paper, 101 x 140 inches. ... And it is black. Longo paints on white paper, which is the only white he uses.