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Han Purple is a color that is close to electric indigo. It is a purple in the sense that the term is used in colloquial English, i.e., it is a color between red and blue; however, it is not a purple in the sense that the term is used in color theory, i.e. a non-spectral color between red and violet on the line of purples on the CIE chromaticity diagram. Perhaps the most accurate designation for the color would be to call it Han Indigo, although it could also be regarded as a bright shade of ultramarine (thinking of ultramarine as a color and not a pigment).
Additional recommended knowledge
Molecular structure, origin, and use
Han Purple or Chinese Blue is a type of artificial pigment with colors blue or purple found in China between 500 B.C. and 220 A.D.. It was used in the decoration of the Xian Terracotta Army. The compound consists of barium, copper, silicon and oxygen with chemical formula BaCuSi2O6 and is related to Egyptian Blue with formula CaCuSi2O6 (calcium and not barium) and it is believed by some that the Chinese variety has Egyptian roots. In a 2007 study on the other hand it is suggested that Chinese Blue is in fact a Chinese invention  . The study identified traces of lead in fragments of Terracotta Army pigment. Lead has never been found in Egyptian Blue but has been used in China as a flux in the production of glass (reducing melting temperature). With Chinese technology available in 500 B.C. barium (as barite or witherite) added a jade-like quality to the glass, in high demand by Taoist monks. The study concludes that the Chinese Blue is a glassmaking spin-off.
Han purple in human culture
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Han_Purple". A list of authors is available in Wikipedia.|