historical-nonfiction: Egyptian blue — a bright blue crystalline substance — is believed to be the first unnatural pigment in human history. Ancient Egyptians used a rare mineral, cuprorivaite, as inspiration for the color. Cuprorivaite was so rare

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historical-nonfiction: Egyptian blue — a bright blue crystalline substance — is believed to be the first unnatural pigment in human history. Ancient Egyptians used a rare mineral, cuprorivaite, as inspiration for the color. Cuprorivaite was so rare

historical-nonfiction: Egyptian blue — a bright blue crystalline substance — is believed to be the first unnatural pigment in human history. Ancient Egyptians used a rare mineral, cuprorivaite, as inspiration for the color. Cuprorivaite was so rare

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