Roman-era Egyptian mummy portrait(Courtesy Phoebe A. Hearst Museum of Anthropology and the Regents of the University of California (catalog no. 6-21379))
Researchers unexpectedly found evidence of Egyptian blue, the earliest known artificial pigment, in sections of paintings from Egypt’s Roman era that lack even a hint of visible blue coloring. These areas include swaths of gray background, a white tunic and mantle, and an under-drawing outlining a face. The paintings are part of a collecti