What is Color Visibility?

“The visible spectrum is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390 to 750 nm. In terms of frequency, this corresponds to a band in the vicinity of 400–790 THz. A light-adapted eye generally has its maximum sensitivity at around 555 nm (540 THz), in the green region of the optical spectrum (see: luminosity function). The spectrum does not, however, contain all the colors that the human eyes and brain can distinguish. Unsaturated colors such as pink, or purple variations such as magenta, are absent, for example, because they can be made only by a mix of multiple wavelengths.” (Ref. http://en.wikipedia.org/wiki/Visible_spectrum ; June 9, 2012)

We see color, our section on perception explained - light bouncing of pigments in paint. Each pigment reflects light differently because of its molecular structure, and this makes colors of paint somewhat different from pure colors as seen in the spectrum- rainbow, or through prism. Sine paint must be made of mineral or vegetable matter; the actual colors of paint may vary greatly from the theoretical model of color wheel.