Archaeological Institute of America

Egyptian Blue, humanity’s first inorganic pigment
2026-02-19 18:30 - 2026-06-11 20:00 (America/Los_Angeles) | Northwest Museum of Arts & Culture, 2316 W 1st Ave, Spokane, WA, 99201, United States
Join us for a lecture by Professor John McCloy, Washington State University, who will present results of an investigation into the materials science and processing parameters to fabricate Egyptian blue faience.
Recently, our group at Washington State University, with the Carnegie Museum of Natural History and the Smithsonian Museum Conservation Institute, recreated Egyptian blue to uncover the science behind its color, ranging from gray or green to deep blue. We produced 12 versions of Egyptian blue and compared them with artifacts, using advanced X-ray techniques, spectroscopy, and quantitative color measurements. We found Egyptian blue is a complex mixture of phases, with hue controlled by particle size, glass content, and cuprorivaite–silica ratios. Even small changes in materials or heating could dramatically shift its color.
These findings reveal ancient craftspeople as skilled materials scientists. Beyond cultural insights and conservation, Egyptian blue’s infrared glow continues to inspire modern technologies, linking past creativity with future innovation.
