"Raphael recreated lost Egyptian blue pigment" Topic
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| Tango01 | 03 Sep 2020 4:05 p.m. PST |
"Egyptian blue, the world's first known synthetic pigment, was used for thousands of years starting around 2600 B.C. The Romans called it caeruleum (the source of the English word cerulean). Vitruvius included a recipe for it in De architectura, Book VII, Chapter 11: Sand is ground with flowers of sulphur, till the mixture is as fine as flour, to which coarse filings of Cyprian copper are added, so as to make a paste when moistened with water; this is rolled into balls with the hand, and dried. The balls are then put into an earthen vessel, and that is placed in a furnace. Thus the copper and sand heating together by the intensity of the fire, impart to each other their different qualities, and thereby acquire their blue colour…."
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Amicalement
Armand |
 PaulCollins  | 03 Sep 2020 4:51 p.m. PST |
Really interesting. Thanks |
| Tango01 | 04 Sep 2020 12:42 p.m. PST |
A votre service mon ami!. (smile) Amicalement
Armand |
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ponders nirvana.
