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The Khazar alliance with the Byzantine empire began to collapse in the early 10th century. Byzantine and Khazar forces may have clashed in the Crimea, and by the 940s emperor Constantine VII Porphyrogenitus was speculating in De Administrando Imperio about ways in which the Khazars could be isolated and attacked. The Byzantines during the same ...
Green is the color between cyan and yellow on the visible spectrum.It is evoked by light which has a dominant wavelength of roughly 495–570 nm.In subtractive color systems, used in painting and color printing, it is created by a combination of yellow and cyan; in the RGB color model, used on television and computer screens, it is one of the additive primary colors, along with red and blue ...
Color Codes: Modern Theories of Color in Philosophy, Painting and Architecture, Literature, Music, and Psychology. Hanover, New Hampshire: University Press of New England. Travis, Tim (2020). The Victoria and Albert Museum Book of Colour in Design. Thames & Hudson. ISBN 978-0-500-48027-4. Varichon, Anne (2005).