Archaeologists excavating near the Colosseum found a rare chunk of Egyptian blue pigment dating back about 2,000 years. Photo from Simona Murrone and the Colosseum Archaeological Park Across the ...
Egyptian blue, also known as calcium copper silicate or cuprorivaite, is a pigment first developed in Egypt and Mesopotamia more than 4,000 years ago. It was used also in ancient Rome, with Romans ...