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. 2021 May 28;11:11296. doi: 10.1038/s41598-021-90759-6

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© The Author(s) 2021

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Raman map of the Egyptian blue paint layer. A remnant of the copper ore used as starting material in the pigment synthesis consists of chalcocite (and/or chalcopyrite) intergrown with magnetite. Hematite, basic copper arsenate, lead oxide and (perhaps) anatase can be interpreted as accessory minerals of the copper ore too.