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Browsing named entities in a specific section of Vitruvius Pollio, The Ten Books on Architecture (ed. Morris Hicky Morgan). Search the whole document.

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Alexandria (Egypt) (search for this): book 7, chapter 11
CHAPTER XI: BLUE. BURNT OCHRE 1. METHODS of making blue were first discovered in Alexandria, and afterwards Vestorius set up the making of it at Puzzuoli. The method of obtaining it from the substances of which it has been found to consist, is strange enough. Sand and the flowers of natron are brayed together so finely that the product is like meal, and copper is grated by means of coarse files over the mixture, like sawdust, to form a conglomerate. Then it is made into balls by rolling it in the hands and thus bound together for drying. The dry balls are put in an earthern jar, and the jars in an oven. As soon as the copper and the sand grow hot and unite under the intensity of the fire, they mutually receive each other's sweat, relinquishing their peculiar qualities, and having lost their properties through the intensity of the fire, they are reduced to a blue colour. 2. Burnt ochre, which is very serviceable in stucco work, is made as follows. A clod of good yellow ochre is heate