Colour (US spelling: color) is a phenomenon of light caused by how our eyes detect differing qualities of projected or reflected light color

One aspect of appearance; a stimulus based on visual response to light, consisting of the three dimensions of hue, saturation and lightness.

Complementary Colors: When two or more colors "go together," they are said to be "complementary." This is completely subjective and open to interpretation and differences in opinion. A more exact definition is "any two colors that, when mixed together produce a neutral gray (paint s/pigments) or white (light).

Primary Colors: This definition really depends on what type of medium of color we are using. The colors that are seen when sunlight is split by a prism are sometimes called the spectral colors. These are red, orange, yellow, green, blue, indigo, and violet. These ROYGBIV colors are often reduced to three "red, green, and blue-violet" which are the primary colors for the additive color system (light). The primary colors for the subtractive color system (paint/pigment) are "cyan, magenta and yellow." Notice that "red, yellow and blue" should never be used as the combination for color primaries!

See also:
"Colour" is in the HS Code "3205"
  Colour Lakes; Preparations Based On Colour Lakes As Specified In Note 3 To This Chapter.

Ref: 122687/2006-09-19

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ISO 105-C09:2001 (Textiles. Tests for colour fastness. Colour ...)

List of books: Colour

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