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Physical Processes Involved in Production of the Ancient Pigment, Egyptian Blue

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Egyptian blue, which was the first synthetic pigment to be used in antiquity, consists of crystals of calcium-copper tetrasilicate (i.e. cuprorivaite (CaCuSi4O10)). The physical processes associated with the formation of Egyptian blue were investigated by high-temperature X-ray diffraction measurements on synthetic mixtures of quartz, malachite, and calcium carbonate. The high-brilliance, high-energy radiation ID15B beamline at the European Synchrotron Radiation Facility was necessary to ensure good time/temperature resolution, penetration, and high-quality data. The results established that the Egyptian blue crystals are formed through nucleation and growth within a liquid or glass phase, even for mixtures with an alkali content as low as 0.3 wt% soda. Furthermore, the microstructures observed in a scanning electron microscope indicated the ancient Egyptian blue pigments were produced from mixtures containing several weight percent of alkali.
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Document Type: Research Article

Affiliations: 1: Dept. Física i Enginyeria Nuclear, ESAB, Campus del Baix Llobregat, 08860 Castelldefels (Barcelona), Spain 2: Dept. d'Enginyeria Química, EPSEVG, 08800 Vilanova i la Geltrú (Barcelona), Spain 3: Research Laboratory for Archaeology and the History of Art, Oxford OX1 3QJ, UK

Publication date: 2006-04-01

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