A synthetic inorganic pigment composed of a double silicate of calcium and copper. Egyptian blue is prepared by heating a mixture of Silica, copper salts, and Calcite in a Sodium carbonate flux to 830 C. This forms a stable blue frit that usually contains some calcite and silica as impurities. Egyptian blue was used by the Egyptians over 5000 years ago as a pottery glaze and as a watercolor pigment in wall paintings. The colorfast pigment has coarse, irregular particles and ranges in color from a powdery blue to a royal blue. Similar materials, later manufactured in Italy and called Pompeian blue and Pozzuoli blue, have similar chemical compositions and optical properties. Egyptian blue is stable in all types of media and is unaffected by acids or alkali.
Synonyms and Related Terms
Pompeian blue; Pigment Blue 31; CI 77437; cuprorivaite (mineral); azul egipcio (Esp.); bleu égyptien (Fr.); bleu d'Alexandrie (Fr.); Ägyptisch Blau (Deut.); Frittenblau (Deut.); Pompejanischblau (Deut.); aigyptiako mple (Gr.); blu egiziano (It.); azzurro pompeiano (It.); fritta blue (It.); fritta egiziana (It.); Egyptisch blauw (Ned.); azul Egípcio (Port.); egyptinsininen (Fin.); lomentum (Lat.) puteolanum (Pliny); irtiu (Egypt.); Ägyptischblau (Deut.); Pozzuoli blue; Alexandria blue; blue frit; Vestorian blue; Italian blue; copper frit; Venetian blue;
Irregular particle shapes. Strong birefringence. Pleochroic from deep blue to colorless. Appears red with Chelsea filter. Ancient Egyptian blue may contain quartz and calcite as impurities.
Insoluble in acids. Unaffected by light or heat.
|Refractive Index||e =1.59, w =1.63|
° J.Riederer, "Egyptian Blue", Artists Pigments, Volume 3, E. West FitzHugh (ed.), Oxford University Press: Oxford, 1997. ° Pigments Through the Ages: Egyptian blue
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