Egyptian Blue
Egyptian blue, also known as calcium copper silicate (CaCuSi4O10 or CaOCuO(SiO2)4 (calcium copper tetrasilicate)) or cuprorivaite, is a pigment used in ancient Egypt for thousands of years. It is considered to be the first synthetic pigment. It was known to the Romans by the name caeruleum – see also the English word cerulean. After the Roman era, Egyptian blue fell from use and the manner of its creation was forgotten.
The ancient Egyptian word wꜣḏ signifies blue, blue-green, and green.
The first recorded use of "Egyptian blue" as a color name in English was in 1809.
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