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Ægyptisk blåt. Et gådefuldt pigment - Sfinx
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Home / All Magazines / SFINX 2018 / Nr. 41:1 Antikkens farver / Ægyptisk blåt. Et gådefuldt pigment

Ægyptisk blåt. Et gådefuldt pigment

Introduktion

Pigmentet ægyptisk blåt har været anvendt i vid udstrækning i Ægypten og resten af Middelhavsområdet fra ca. 3000 år f.v.t. Det er en kalciumkobbersilikat-forbindelse svarende til det naturligt forekommende, sjældne mineral cuprorivait. Ægyptisk blåt fremstilles ved at gløde kvartssand, kalk, soda og en kobberforbindelse til ca. 850 ºC. Pigmentet er krystalagtigt og minder om fint, knust glas. Afhængig af fremstillingsprocessen kan ægyptisk blåt variere i farven fra en mættet, næsten blåsort nuance til en lyseblå, blågrøn eller blålilla nuance. Det er langt mere modstandsdygtigt over for ydre påvirkninger end mineralet azurit, som ligeledes anvendtes ........

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