The Greatest Empires & Civilizations of the Ancient East: Egypt, Babylon, The Kings of Israel and Judah, Assyria, Media, Chaldea, Persia, Parthia & Sasanian Empire. George Rawlinson
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СКАЧАТЬ frequently to be intended when the term purple (πορφύριος, purpureus) is used.

      The colours were obtained, commonly, at any rate, from metallic oxides. The ordinary blue employed is cobalt, though it is suspected that there was an occasional use of copper. Copper certainly furnished the greens, while manganese gave the brown, which shades off into purple and into black. The beautiful milky white which forms the ground tint of some vases is believed to have been derived from the oxide of tin, or else from phosphate of chalk. It is said that the colouring matter of the patterns does not extend through the entire thickness of the glass, but lies only on the outer surface, being a later addition to the vessels as first made.