A color term, also known as a color name, is a word or phrase that refers to a specific color. The color term may refer to human perception of that color (which is affected by visual context), or to an underlying physical property (such as a specific wavelength of visible light). There are also numerical systems of color specification, referred to as color spaces.
In natural languages
Monolexemic color words are composed of individual lexemes, or root words, such as "red", "brown", or "olive". Compound color words make use of adjectives (e.g. "light brown", "sea green") or multiple basic color words (e.g. "yellow-green").
There are many different dimensions by which color varies. For example, hue (shades of red, orange, yellow, green, blue, and purple), saturation ("deep" vs. "pale"), and brightness or intensity make up the HSI color space. The adjective "fluorescent" in English refers to moderately high brightness with strong color saturation. Pastel refers to colors with high brightness and low saturation.
Some phenomena are due to related optical effects, but may or may not be described separately from the color name. These include gloss (high-gloss shades are sometimes described as "metallic"; this is also a distinguishing feature of gold and silver), iridescence or goniochromism (angle-dependent color), dichroism (two-color surfaces), and opacity (solid vs. translucent).
Different cultures have different terms for colors, and may also assign some color terms to slightly different parts of the human color space: for instance, the Chinese character 青 (pronounced qīng in Mandarin and ao in Japanese) has a meaning that covers both blue and green; blue and green are traditionally considered shades of "青." In more contemporary terms, they are 藍 (lán, in Mandarin) and 綠 (lǜ, in Mandarin) respectively. Japanese also has two terms that refer specifically to the color green, 緑 (midori, derived from the classical Japanese descriptive verb midoru "to be in leaf, to flourish" in reference to trees) and グリーン (guriin, which is derived from the Dutch word "groen"). However, in Japan, although the traffic lights have the same colors that other countries have, the green light is described using the same word as for blue, aoi, because green is considered a shade of aoi; similarly, green variants of certain fruits and vegetables such as green apples, green shiso (as opposed to red apples and red shiso) will be described with the word aoi.
Similarly, languages are selective when deciding which hues are split into different colors on the basis of how light or dark they are. English splits some hues into several distinct colors according to lightness: such as red and pink or orange and brown. To English speakers, these pairs of colors, which are objectively no more different from one another than light green and dark green, are conceived of as belonging to different categories. A Russian will make the same red/pink and orange/brown distinctions, but will also make a further distinction between sinii and goluboi, which English speakers would simply call dark and light blue. To Russian speakers, sinii and goluboi are as separate as red and pink or orange and brown.
Several researchers have studied the OvaHimba perception of colors. The OvaHimba use four color names: zuzu stands for dark shades of blue, red, green and purple; vapa is white and some shades of yellow; buru is some shades of green and blue; and dambu is some other shades of green, red and brown. It is thought that this may increase the time it takes for the OvaHimba to distinguish between two colors that fall under the same Herero color category, compared to people whose language separates the colors into two different color categories.
Hungarian and Turkish have multiple words for "red": piros and vörös (Hungarian; vörös is a darker red), and kırmızı, al, and kızıl (Turkish); kırmızı now includes all reds but originally referred to crimson, to which it is cognate, while kızıl mainly refers to scarlet and other orange-tinted or brownish reds. Two words for "red" are also found in Irish and Scottish Gaelic (dearg for light, bright red and rua or ruadh respectively for dark, brownish red). Turkish also has two words for "white" (beyaz and ak) and "black" (siyah and kara). Ak and beyaz have the same meaning, while kara is a broader term than siyah and also includes dark browns; which word is used also depends on the kind of object being described. Similarly, Irish uses two words for green: glas denotes the green color of plants, while uaithne describes artificial greens of dyes, paints etc. This distinction is made even if two shades are identical.
Basic color terms
However, Brent Berlin and Paul Kay, in their classic study of worldwide color naming Basic Color Terms: Their Universality and Evolution (1969), argued that these differences can be organized into a coherent hierarchy, and that there are a limited number of universal "basic color terms" which begin to be used by individual cultures in a relatively fixed order. Berlin and Kay based their analysis on a comparison of color words in 20 languages from around the world. To be considered a basic color term, the words had to be
- monolexemic ("green", but not "light green" or "forest green"),
- high-frequency, and
- agreed upon by speakers of that language.
Their analysis showed that in a culture with only two terms, they would roughly correlate with "dark" (covering black, dark colors, and cold colors such as blue) and "bright" (covering white, light colors, and warm colors such as red). All languages with three colors terms would add red to this distinction. Thus, the three most basic colors are black, white, and red. Additional color terms are added in a fixed order as a language evolves: first one of green or yellow; then the other of green or yellow; then blue. All languages distinguishing six colors contain terms for black, white, red, green, yellow, and blue. These colors roughly correspond to the sensitivities of the retinal ganglion cells, leading Berlin and Kay to argue that color naming is not merely a cultural phenomenon, but is one that is also constrained by biology—that is, language is shaped by perception. A 2012 study suggested that the origin of this hierarchy may be tied to human vision and the time ordering in which these color names get accepted or agreed upon in a population perfectly matches the order predicted by the hierarchy.
As languages develop, they next adopt a term for brown; then terms for orange, pink, purple, and/or gray, in any order. Finally, a basic light/dark relativistic term appears: such as "light" blue / "dark" blue (in comparison to blue sky / blue ocean), or "pale" red / "deep" red.
Today every natural language that has words for colors is considered to have from two to twelve basic color terms. All other colors are considered by most speakers of that language to be variants of these basic color terms. English contains eleven basic color terms: "black", "white", "red", "green", "yellow", "blue", "brown", "orange", "pink", "purple", and "gray". Italian, Russian and Hebrew have twelve, distinguishing blue and azure. That doesn't mean English speakers cannot describe the difference of the two colors, of course; however, in English, azure is not a basic color term because one can say bright sky blue instead, while pink is basic because speakers do not say light red.
Abstract and descriptive color words
Color words in a language can also be divided into abstract color words and descriptive color words, though the distinction is blurry in many cases. Abstract color words are words that only refer to a color. In English white, black, red, yellow, green, blue, brown, and gray are abstract color words. These words also happen to be 'basic color terms' in English as described above, but colors like maroon and magenta are also abstract though they may not be considered 'basic color terms', either because they are considered by native speakers to be too rare, too specific, or subordinate hues of more basic colors (red in the case of maroon, or purple in the case of magenta).
Descriptive color words are words that are secondarily used to describe a color but primarily used to refer to an object or phenomenon. "Salmon", "rose", "saffron", and "lilac" are descriptive color words in English because their use as color words is derived in reference to natural colors of salmon flesh, rose flowers, infusions of saffron pistils, and lilac blossoms respectively. Often a descriptive color word will be used to specify a particular hue of basic color term (salmon and rose [descriptive] are both hues of pink).
Colors in some languages may be denoted by descriptive color words even though other languages may use an abstract color word for the same color; for example in Japanese pink is momoiro (桃色, lit. "peach-color") and gray is either haiiro or nezumiiro (灰色, 鼠色, lit. "ash-color" for light grays and "mouse-color" for dark grays respectively); nevertheless, as languages change they may adopt or invent new abstract color terms, as Japanese has adopted pinku (ピンク) for pink and guree (グレー) for gray from English.
The status of some color words as abstract or descriptive is debatable. The color "pink" was originally a descriptive color word derived from the name of a flower called a "pink" (see dianthus); however, because the word "pink" (flower) has become very rare whereas "pink" (color) has become very common, many native speakers of English use "pink" as an abstract color word alone and furthermore consider it to be one of the basic color terms of English. The name "purple" is another example of this shift, as it was originally a word that referred to a dye (see Tyrian purple).
The word "orange" is difficult to categorize as abstract or descriptive because both its uses, as a color word and as a word for an object, are very common and it is difficult to distinguish which of the two is primary. As a basic color term it became established in the early to mid 20th century; before that time artist's palettes called it "yellow-red". In English, the use of the word "orange" for a fruit predates its use as a color term. The word comes French orenge, which derives via Sanskrit narang from a Dravidian language such as Tamil or Tulu. The derived form orangish as a color is attested from the late 19th century. by reference to the fruit. Nevertheless, "orange" (color) is usually given equal status to red, yellow, green, blue, purple, brown, pink, gray, white and black (all abstract colors) in membership among the basic color terms of English. Based solely on current usage of the word, it would be impossible to distinguish whether the fruit is called an orange because of its color, or the color is so called after the fruit. (This problem is also illustrated by violet and indigo.)
In Italian there is an adjective arancione different of and derived from the fruit name arancio. In Portuguese, it is usual to distinguish the fruit laranja from the color name cor-de-laranja, which means 'color-of-orange'. The same goes for Rosa ('rose') and cor-de-rosa ('color-of-rose'); and Violeta ('violet') and cor-de-violeta ('color-of-violet').
Some examples of color naming systems are CNS and ISCC–NBS lexicon of color terms. The disadvantage of these systems, however, is that they only specify specific color samples, so while it is possible to, by interpolating, convert any color to or from one of these systems, a lookup table is required. In other words, no simple invertible equation can convert between CIE XYZ and one of these systems.
Philatelists traditionally use names to identify postage stamp colors. While the names are largely standardized within each country, there is no broader agreement, and so for instance the US-published Scott catalog will use different names than the British Stanley Gibbons catalogue.
On modern computer systems a standard set of basic color terms is now used across the web color names (SVG 1.0/CSS3), HTML color names, X11 color names and the .NET Framework color names, with only a few minor differences.
Naming colors for marketing purposes
Color naming in fashion and paint exploits the subjectiveness and emotional context of words and their associations. This is particularly seen in the naming of paint chips and samples where paint is sold. Thus the same "poppy yellow" can become either the hot-blooded and active "amber rage", the cozy and peaceful "late afternoon sunshine", or the wealth-evoking "sierra gold". The divisions of General Motors often give different names to the same colors featured on different car models. In addition to making a particular product seem more attractive to a target audience, the attachment of an emotional context to a color sample by choice of name may enhance the rapidity of selection.
Neon and fluorescent
Names given to the most vivid colors often include the word neon, alluding to the bright glow of neon lighting. Dyes and inks producing these colors are often fluorescent, producing a luminous glow when viewed under a black light, and such pigments appear significantly brighter in mid-day overcast conditions due to a greater proportion of ultraviolet light.
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