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Yellow is the color evoked by light that stimulates both the L and M (long and medium wavelength) cone cells of the retina about equally, with no significant stimulation of the S (short-wavelength) cone cells. Light with a wavelength of 570–580 nm is yellow, as is light with a suitable mixture of somewhat longer and shorter wavelengths. Yellow's traditional RYB complementary color is purple, violet, or indigo, while its colorimetrically defined complementary color in both RGB and CMYK color spaces is blue.

Etymology and definitions

The word yellow comes from the Old English geolu, or geolwe which derived from the Proto-Germanic word gelwaz. The oldest known use of this word in English is in the Old English poem Beowulf, in a description of a shield made of wood from a yew tree.

In the English language, yellow has traditionally been associated with jaundice and cowardice. Yellow is associated with the word "caution" and is the second light on stop lights; in American slang, a coward can be said to be "yellowbellied" or "yellow". The color is associated with aging as well, for both people and objects (e.g. "yellowed" paper). Ethnographically, the term "yellow" has been used as a slang term for both Oriental persons ("yellow peril") and, in the early 20th century, light-skinned African-Americans (High yellow).

"Yellow" ("giallo"), in Italy, refers to crime stories, both fictional and real. This association began in about 1930, when the first series of crime novels published in Italy had yellow covers. The term "yellow movie" (黃色電影) can refer to films of pornographic nature in Chinese culture, and is analogous to the English "blue movie". Lastly, it is associated with sensational journalistic practices, or yellow journalism, and resistance to militant trade unions.

In science

Colorimetry

Hunt defines that "two colors are complementary when it is possible to reproduce the tristimulus values of a specified achromatic stimulus by an additive mixture of these two stimuli." That is, when two colored lights can be mixed to match a specified white (achromatic, non-colored) light, the colors of those two lights are complementary. This definition, however, does not constrain what version of white will be specified. In the nineteenth century, the scientists Grassmann and Helmholtz did experiments in which they concluded that finding a good complement for spectral yellow was difficult, but that the result was indigo, that is, a wavelength that today's color scientists would call violet. Helmholtz says "Yellow and indigo blue" are complements. Grassman reconstructs Newton's category boundaries in terms of wavelengths and says "This indigo therefore falls within the limits of color between which, according to Helmholtz, the complementary colors of yellow lie." Newton's own color circle has yellow directly opposite the boundary between indigo and violet. These results, that the complement of yellow is a wavelength shorter than 450 nm, are derivable from the modern CIE 1931 system of colorimetry if it is assumed that the yellow is about 580 nm or shorter wavelength, and the specified white is the color of a blackbody radiator of temperature 2800 K or lower (that is, the white of an ordinary incandescent light bulb). More typically, with a daylight-colored or around 5000 to 6000 K white, the complement of yellow will be in the blue wavelength range, which is the standard modern answer for the complement of yellow.

Astronomy

Stars of spectral classes F and G, such as our sun Sol, have color temperatures that make them look "yellowish". The first astronomer to classify stars according to their color was F. G. W. Struve in 1827. One of his classifications was flavae, or yellow, and this roughly corresponded to stars in the modern spectral range F5 to K0. The Strömgren photometric system for stellar classification includes a 'y' or yellow filter that is centered at a wavelength of 550 nm and has a bandwidth of 20–30 nm.

Biology

Pigments



Birds

Yellow-breasted Chat
  • Yellow-breasted Chats (Icteria virens) are large foraging songbird found in southern parts of Canada, the United States, Mexico, and Central America. They are olive with a white bellies and a yellow throat and breast, with a long tail, a thick heavy bill, a large white eye ring, and dark legs.
Yellowhammer
  • The Yellowhammer (Emberiza citrinella) is a passerine in the bunting family Emberizidae. It breeds across Europe and much of Asia. Most yellowhammers are resident, but some far northern birds migrate south in winter. It is common in all sorts of open areas with some scrub or trees. They are large with a thick seed-eater's bill. The males have a bright yellow head, yellow underparts, and a heavily streaked brown back. Females are much duller and more streaked below.
  • The Yellow-shafted Flicker (Colaptes auratus) is a large woodpecker species of eastern North America. They have yellow shafts on their wing and tail feathers.


Fish

  • Yellowtail is the common name for dozens of different fish species that have yellow tails or a yellow body.
  • Yellowfin tuna (Thunnus albacares) is a species of tuna, having bright yellow anal and second dorsal fins. Found in tropical and subtropical seas and weighing up to , it is caught as a replacement for the depleted stocks of bluefin tuna.


Insects



  • Yellowjackets are black-and-yellow wasps of the genus Vespula or Dolichovespula (though some can be black-and-white, the most notable of these being the bald-faced hornet, Dolichovespula maculata). They can be identified by their distinctive black-and-yellow color, small size (slightly larger than a bee), and entirely black antennae.


Trees



Other plants



Algae



Electric yellow vs. process yellow

The color box at right shows the most intense yellow representable in 8-bit RGB color model; yellow is a secondary color in an additive RGB space.

The measured light spectrum from yellow pixels on a typical computer display is complex, and very unlike the reflectance spectrum of a yellow object such as a banana.

Process yellow (also known as pigment yellow, printer's yellow or canary yellow) is one of the three colors typically used as subtractive primary colors, along with magenta and cyan. The CMYK system for color printing is based on using four inks, one of which is a yellow color. This is in itself a standard color, and a fairly narrow range of yellow inks or pigments are used. Process yellow is based on a colorant that reflects the preponderance of red and green light, and absorbs most blue light, as in the reflectance spectra shown in the figure on the lower right.

Because of the characteristics of paint pigments and use of different color wheels, painters traditionally regard the complement of yellow as the color indigo or blue-violet.

Process yellow is not an RGB color, and there is no fixed conversion from CMYK primaries to RGB. Different formulations are used for printer's ink, so there can be variations in the printed color that is pure yellow ink.

Lasers

Lasers emitting in the yellow part of the spectrum are much less common than most other colors. They are also much more expensive than comparable lasers because the difference in energy levels between the metastable and the ground state required for laser action is difficult to create for yellow photons. In commercial products diode pumped solid state (DPSS) technology is employed to create the yellow light. An infrared laser diode at 808 nm is used to pump a crystal of neodymium-doped yttrium vanadium oxide (Nd:YVO4) or neodymium-doped yttrium aluminium garnet (Nd:YAG) and induces it to emit at two frequencies (wavelengths of 064 nm and 1342 nm) simultaneously. This deeper infrared light is then passed through another crystal containing potassium, titanium and phosphorus (KTP), whose non-linear properties generate light at a frequency that is the sum of the two incident beams; in this case corresponding to the required wavelength of 593.5 nm (yellow).

Minerals and chemistry

Structure of Titan Yellow


Pigments

Reflectance spectra of yellow pigments, as a percentage of white (Abney 1891)
  • Yellow ochre (also known as Mars yellow, Pigment yellow 42, 43), hydrated ferric oxide ( ), is a naturally occurring pigment found in clays in many parts of the world. It is non-toxic and has been used in painting since prehistoric times.
  • Indian yellow is a transparent, fluorescent pigment used in oil paintings and watercolors. Originally magnesium euxanthate, it was claimed to have been produced from the urine of Indian cows fed only on mango leaves. It has now been replaced by synthetic Indian yellow hue.
  • Naples Yellow (lead antimonate yellow) is one of the oldest synthetic pigments, derived from the mineral bindheimite and used extensively up to the 20th century. It is toxic and nowadays is replaced in paint by a mixture of modern pigments.
  • Cadmium Yellow (cadmium sulfide, CdS) has been used in artists' paints since the mid-19th century. Because of its toxicity, it may nowadays be replaced by azo pigments.
  • Chrome Yellow (lead chromate, ), derived from the mineral crocoite, was used by artists in the earlier part of the 19th century, but has been largely replaced by other yellow pigments because of the toxicity of lead.
  • Titanium Yellow (nickel antimony titanium yellow rutile, ) is created by adding small amounts of the oxides of nickel and antimony to titanium dioxide and heating. It is used to produce yellow paints with good white coverage and has the LBNLmarker paint code "Y10".
  • Gamboge is an orange-brown resin, derived from trees of the genus Garcinia, which becomes yellow when powdered. It was used as a watercolor pigment in the far east from the 8th century - the name "gamboge" is derived from "Cambodiamarker" - and has been used in Europe since the 17th century.
  • Orpiment, also called King's Yellow or Chinese Yellow is arsenic trisulfide ( ) and was used as a paint pigment until the 19th century when, because of its high toxicity and reaction with lead-based pigments, it was generally replaced by Cadmium Yellow.


In human culture

Cultural associations

Maya glyph for "yellow"
  • The ancient Maya associated the color yellow with the direction South. The Maya glyph for "yellow" (k'an) also means "precious" or "ripe".
  • The word yellow can be used as an adjective for the word cowardly.


Cancer

  • Cyclist Lance Armstrong's "Livestrong" campaign has also been associated with the color yellow.


History



Journalism

The Yellow Kid


Music

Yellow Submarine model at Liverpool Airport in November 2007


Politics



Sports

30pix






Transportation

  • In some countries, taxicabs are commonly yellow. This practice began in Chicago, where taxi entrepreneur John D. Hertz painted his taxis yellow based on a University of Chicagomarker study alleging that yellow is the color most easily seen at a distance.
  • In Canada and the United States, school buses are almost uniformly painted a yellow color (often referred to as "school bus yellow") for purposes of visibility and safety, and British bus operators such as FirstGroup plc are attempting to introduce the concept there.
  • "Caterpillar yellow" and "high-visibility yellow" are used for highway construction equipment.
  • In the rules of the road, yellow (called "amber" in Britain) is a traffic light signal warning that the period in which passage is permitted is coming to an end. It is intermediate between green (go) and red (stop). In railway signaling, yellow is often the color for warning, slow down, such as with distant signals.
  • Yellow warning signs, especially with black wording, borders, or alternating stripes, are used in many countries around the world to indicate caution, both as road signs and for other uses such as "caution, slippery floor".
  • Several light rail and rapid transit lines on various public transportation have a Yellow Line.


Vexillology



See also



References

  1. Online Etymology Dictionary
  2. Oxford English Dictionary
  3. Kisimoto,Ryoiti (1968) Yellow Pan Water Trap for Sampling the Small Brown Planthopper, Laodelphax striatellus (FALLEN), a Vector of the Rice Stripe Virus. Japanese Society of Applied Entomology and Zoology 3(1):37-48
  4. Webb, S. E., M. L. Kok-Yokomi, and D. J. Voegtlin (1994) Effect of Trap Color on Species Composition of Alate Aphids (Homoptera: Aphididae) Caught over Watermelon Plants Florida Entomologist 77(1):146-153 PDF
  5. River Birch Trees | Fall Foliage | White Birches
  6. - described as "Very rare yellow laser colour".



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