Color The science of color is sometimes called chromatics, colorimetry, or simply color science. It includes the study of the perception of color by the human eye and brain, the origin of color in materials, color theory in art, and the physics of electromagnetic radiation in the visible range (that is, what is commonly referred to simply as "light"). Electromagnetic radiation is characterized by its wavelength (or frequency) and its intensity. When the wavelength is within the visible spectrum (the range of wavelengths humans can perceive, approximately from 390 nm to 700 nm), it is known as "visible light". Most light
Colour guard carry the M1, M-16, FN FAL or Pindad SSD-1 rifle while the colour officer carries his/her sabre. Composition of the Indonesian colour guard unit The Dutch armed forces have similar ranks corresponding to a colour guard, the "vaandrig" and "kornet" (aspirant officers who have not been sworn in yet). Russian colour guards are composed of: Active units, military academies, and guards of honor carry sabers in the color guard, if needed, rifles may be substituted. The same design is used for color guards in countries of the CIS. If there are multiple color guards marching in a parade at the