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Etymology edit

Egyptian +‎ blue, from being a blue invented by Ancient Egyptians

Noun edit

Egyptian blue (countable and uncountable, plural Egyptian blues)

  1. 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.

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