Color Color Color (American English), or colour (Commonwealth English), is the characteristic of human visual perception described through color "categories", with names such as red, orange, yellow, green, blue, or purple. This perception of color derives from the stimulation of cone cells in the human eye by electromagnetic radiation in the visible spectrum. Color categories and physical specifications of color are associated with objects through the wavelength of the light that is reflected from them. This reflection is governed by the object's physical properties such as light absorption, emission spectra, etc. By defining a color space, colors can be identified numerically
Colour revolution groups, even borrowing the colour orange from the Ukrainian revolution. In November 2005 protesters took to the streets, waving orange flags and banners, to protest what they considered government fraud in recent parliamentary elections. The Azerbaijani colour revolution finally fizzled out with the police riot on 26 November, during which dozens of protesters were injured and perhaps hundreds teargassed and sprayed with water cannons. On February 5, 2013, protests began in Shahbag and later spread to other parts of Bangladesh following demands for capital punishment for Abdul Quader Mollah, who had been sentenced to life imprisonment, and for others convicted