Noun
Egyptian blue (uncountable)
A pigment made from calcium copper tetrasilicate (“CaCuSi4O10”), the first artificial pigment, a blue, used by Egyptians for over 3 millennia, before dying out during the Roman Empire; one of the few alternates to lapis lazuli during ancient times.
Eva Heller, Psychologie de la couleur: effets et symboliques, pg. 17 Blue glass was manufactured in Mesopotamia and Egypt as early as 2500 BC, using the same copper ingredients as Egyptian blue pigment. Source: Internet
Minor renovations were only made in 2017, when the market was repainted in white with Egyptian blue border on the edges and windows. Source: Internet
ISBN 0-262-02061-0 Egyptian blue was used to paint wood, papyrus and canvas, and was used to colour a glaze to make faience beads, inlays, and pots. Source: Internet
The Egyptians had created a synthetic colour, Egyptian blue, three thousand years BC, but the formula had been lost. Source: Internet