Egyptian blue

Egyptian blue, also known as calcium copper silicate (CaCuSi4O10 or CaOCuO(SiO2)4 (calcium copper tetrasilicate)) or cuprorivaite, is a pigment that was 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. After the Roman era, Egyptian blue fell from use and, thereafter, the manner of its creation was forgotten. In modern times, scientists have been able to analyze its chemistry and reconstruct how to make it.

"Caeruleum" redirects here. For the genus of lamprey, see Caeruleum (lamprey). For the genus of lichen fungus, see Caeruleum (lichen).
Egyptian blue
 
    Color coordinates
Hex triplet#1034A6
sRGBB (r, g, b)(16, 52, 166)
HSV (h, s, v)(226°, 90%, 65%)
CIELChuv (L, C, h)(28, 82, 263°)
Source[Unsourced]
ISCC–NBS descriptorVivid blue
B: Normalized to [0–255] (byte)

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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