blue

Pure blue, also known as high blue, is not mixed with any other colours.

A block of Lapis lazuli originally used to make ultramarine

http://en.wikipedia.org/wiki/Blue

Blue pigments were originally made from minerals such as lapis lazuli and azurite, and blue dyes were made from plants; usually woad in Europe, and Indigofera tinctoria, or True indigo, in Asia and Africa. Today almost blue pigments and dyes are made by the chemical industry.

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Contents

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• 1 Shades and variations of blue
• 2 Etymology and linguistic differences
• 3 History of blue
  • 3.1 Blue in the ancient world
  • 3.2 Blue in the Byzantine Empire and the Islamic World
  • 3.3 Blue during the Middle Ages
  • 3.4 Blue in the European Renaissance
  • 3.5 Blue and white porcelain
  • 3.6 The war of the blues – indigo versus woad
  • 3.7 The blue uniform
  • 3.8 The search for the perfect blue
  • 3.9 Blue and the Impressionist painters
  • 3.10 The blue suit
  • 3.11 Blue in the 20th and 21st century
• 4 Blue in science and industry
  • 4.1 Blue pigments and dyes
  • 4.2 Spectral and pigment blues
  • 4.3 Scientific natural standards for blue
  • 4.4 Why the clear sky and the deep sea are seen as blue
  • 4.5 Lasers
• 5 Blue in nature
  • 5.1 Animals
• 6 Blue in world culture
  • 6.1 Blue as a national and international colour
  • 6.2 Politics
  • 6.3 Religion
  • 6.4 Music
  • 6.5 Symbolism
• 7 Sports
  • 7.1 The blues of antiquity
  • 7.2 Association football
  • 7.3 North American sporting leagues
• 8 Shades
• 9 See also
• 10 Bibliography
• 11 References
• 12 External links