Editing Subtractive color (section)

== RYB ==
{{Main|RYB color model}}
[[File:BYR color wheel.svg|thumb|left|An RYB color wheel]]

RYB (red, yellow, blue) is the traditional set of primary colors used for mixing pigments. It is used in art and art education, particularly in [[painting]]. It predated modern scientific [[color theory]].

Red, yellow, and blue are the primary colors of the RYB [[color wheel|color "wheel"]]. The secondary colors, violet (or purple), orange, and green (VOG) make up another triad, conceptually formed by mixing equal amounts of red and blue, red and yellow, and blue and yellow, respectively.

[[File:Pigment Colours - Classification.jpg|thumb|Classification of pigment colors]]

The RYB primary colors became the foundation of 18th-century theories of color vision as the fundamental sensory qualities blended in the perception of all physical colors and equally in the physical mixture of pigments or dyes. These theories were enhanced by 18th-century investigations of a variety of purely psychological color effects, in particular, the contrast between "complementary" or opposing hues produced by color afterimages and in the contrasting shadows in colored light. These ideas and many personal color observations were summarized in two founding documents in color theory: the ''[[Theory of Colours]]'' (1810) by the German poet and government minister [[Johann Wolfgang von Goethe]], and ''The Law of Simultaneous Color Contrast'' (1839) by the French industrial chemist [[Michel Eugène Chevreul]].

In late 19th and early to mid-20th-century commercial printing, use of the traditional RYB terminology persisted even though the more versatile CMY (cyan, magenta, yellow) triad had been adopted, with the cyan sometimes referred to as "process blue" and the magenta as "process red".