Blue
— Spectral coordinates —
Wavelength		440–490 nm
— Common connotations —
ice, water, sky, sadness, winter, royalty, boys, cold, calm, magic, trueness (taken from the fact that the sky is blue in its constancy, i.e.: 'true blue', the sky is unwaveringly blue on a clear day), conservatism (universally), liberalism (US), and capitalism
— Colour coordinates —
Hex triplet		#0000FF
sRGBB	(r, g, b)	(0, 0, 255)
HSV	(h, s, v)	(240°, 100%, 100%)
Source		HTML/CSS[1]
B: Normalized to [0–255] (byte)

Blue is a colour, the perception of which is evoked by light having a spectrum dominated by energy with a wavelength of roughly 440–490 nm. It is considered one of the additive primary colours. On the HSV Colour Wheel, the complement of blue is yellow; that is, a colour corresponding to an equal mixture of red and green light. On a colour wheel based on traditional colour theory (RYB), the complementary colour to blue is considered to be orange (based on the Munsell colour wheel).^[2] The English language commonly uses "blue" to refer to any colour from navy blue to cyan. The word itself is derived from the Old French word bleu.

Etymology and definitions

Blueberries

Lactarius indigo is one of only a few blue-coloured mushrooms

Blue Turkish Tiles

The sky and water often appear blue

The modern English word blue comes from the Middle English, bleu or blwe, which came from an Old French word bleu of Germanic origin (Frankish or possibly Old High German blao, "shining"). Bleu replaced Old English blaw. The root of these variations was the Proto-Germanic blæwaz, which was also the root of the Old Norse word bla and the modern Icelandic blár, and the Scandinavian word blå, but it can refer to other non blue colours. A Scots and Scottish English word for "blue-grey" is blae, from the Middle English bla ("dark blue", from the Old English blæd). Ancient Greek lacked a word for blue and Homer called the colour of the sea "wine dark", except that the word kyanos (cyan) was used for dark blue enamel. As a curiosity, blue is thought to be cognate with blond, blank and black through the Germanic word. Through a Proto-Indo-European root, it is also linked with Latin flavus ("yellow"; see flavescent and flavine), with Greek phalos (white), French blanc (white, blank) (borrowed from Old Frankish), and with Russian белый, belyi ("white," see beluga), and Welsh blawr (grey) all of which derive (according to the American Heritage Dictionary) from the Proto-Indo-European root *bhel- meaning "to shine, flash or burn", (more specifically the word bhle-was, which meant light coloured, blue, blond, or yellow), whence came the names of various bright colours, and that of colour black from a derivation meaning "burnt" (other words derived from the root *bhel- include bleach, bleak, blind, blink, blank, blush, blaze, flame, fulminate, flagrant and phlegm).

In the English language, blue may refer to the feeling of sadness. "He was feeling blue". This is because blue was related to rain, or storms, and in Greek mythology, the god Zeus would make rain when he was sad (crying), and a storm when he was angry. Kyanos was a name used in Ancient Greek to refer to dark blue tile (in English it means blue-green or cyan).^[3] The phrase "feeling blue" is linked also to a custom among many old deepwater sailing ships. If the ship lost the captain or any of the officers during its voyage, she would fly blue flags and have a blue band painted along her entire hull when returning to home port.^[4]

Many languages do not have separate terms for blue and or green, instead using a cover term for both (when the issue is discussed in linguistics, this cover term is sometimes called grue in English).

In science

Pigments

Traditionally, blue has been considered a primary colour in painting, with the secondary colour orange as its complement.

Blue pigments include azurite (Cu₃(CO₃)₂(OH)₂), ultramarine (Na_8-10Al₆Si₆O₂₄S_2-4), cerulean blue (primarily cobalt (II) stanate: Co₂SnO₄), cobalt blue (cobalt(II) aluminate: CoAl₂O₄), and Prussian blue (milori blue: primarily Fe₇(CN)₁₈).

Scientific natural standards for blue

• Emission spectrum of Cu²⁺
• Electronic spectrum of aqua-ions Cu(H₂O)2+5

Animals

Dendrobates azureus

Blue Jay

• When an animal's coat is described as "blue", it usually refers to a shade of grey that takes on a bluish tint, a diluted variant of a pure black coat.^{[citation needed]} This designation is used for a variety of animals, including dog coats, some rat coats, cat coats, some chicken breeds, some horse coat colours and rabbit coat colours. Some animals, such as Giraffes and Lizards, also have blue tongues.

In human culture

Symbolic language

• In the English language, blue often represents the human emotion of sadness, e.g. "He was feeling blue". In German, on the other hand, to be "blue" (blau sein) is to be drunk. This derives from the ancient use of urine (which is produced copiously by the human body after drinking alcohol) in dyeing cloth blue with woad or indigo.^[5]

National colours

Flag of Greece

Coat of Arms symbol of Israel

Flag of Somalia

• Azzurro, a light blue, is the national colour of Italy (from the livery colour of the former reigning family, the House of Savoy).
• Blue is the national sports colour for India, as it denotes secularism.^{[citation needed]}
• Blue is the national colour used on flags of several countries surrounded by seas or oceans such as Australia and Europe, though not necessarily with this interpretation in mind.
• Blue and white are the national colours of Argentina, El Salvador, Finland, Greece, Guatemala, Honduras, Israel, Micronesia, Nicaragua, and Somalia as well as of the United Nations Organization using a light shade of blue symbolizing peace.
• Blue and yellow are the national colours of Barbados, Kazakhstan, Palau, Sweden, and Ukraine, and along with green, of Brazil, and along with red, of Chad, Colombia, Ecuador, Moldova, Romania, and Venezuela.
• Blue, white and yellow are the national colours of Bosnia and Herzegovina, Kosovo and Uruguay.
• Blue and red are the national colours of Haiti and Liechtenstein, and (along with white) of Australia, Cambodia, Costa Rica, Chile, Croatia, Cuba, the Czech Republic, the Dominican Republic, France, Iceland, North Korea, Laos, Liberia, Luxembourg, Myanmar, Nepal, the Netherlands, New Zealand, Norway, Panama, Paraguay, Russia, Samoa, Serbia, Slovakia, Slovenia, Thailand, the United Kingdom, and the United States
• Blue, white and black are the national colours of Estonia.^[6]

Mysticism

• In the metaphysics of the "New Age Prophetess", Alice Bailey, in her system called the Seven Rays which classifies humans into seven different metaphysical psychological types, the "first ray" of "will-power" is represented by the colour blue. People who have this metaphysical psychological type are said to be "on the Blue Ray".^[7]
• In Hinduism, Blue is used to symbolically represent the fifth, throat chakra (Vishuddha).^[8]
• Psychics who claim to be able to observe the aura with their third eye report that someone with a blue aura is a person who is oriented toward spirituality.^[9] People with blue auras are said to be interested in social service work and to be in occupations such as social worker, counsellor, teacher, writer, and psychologist.^[10]

Politics

This section does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (October 2007)

• The Blue House is the residence of the President of South Korea.
• Blue has been associated with a variety of political positions, often differentiated from communist red or anarchist black. During the revolt in the Vendée against the French revolution, blues stood for the revolutionary forces, and white for the counter-revolutionaries. Later movements like the Breton blues used the colour to signify allegiance to the ideals of the revolution.
• The blueshirts was a quasi-fascist political organization active in Ireland during the 1930s (the name comes from the fact that St. Patrick's Blue is one of the traditional colours of Ireland).
• Blue is the colour of the respective British and Canadian Conservative parties. In the United States, however, it has become fashionable since the 2000 Presidential Election to refer to the Democratic Party as "blue" and the Republican Party as "red", particularly as in reference to "red states and blue states". In Brazil, blue states are the ones in which the Social Democratic Party has the majority, in opposition to the Workers' Party, usually represented by red.

Blue stripes on a traditional Jewish tallit.

Religion

• Blue is associated in Christianity generally and Catholicism in particular, with the Virgin Mary.
• Blue in Hinduism: Many of the gods are depicted as having blue-coloured skin, particularly those associated with Vishnu, who is said to be the Preserver of the world and thus intimately connected to water. Krishna and Ram, Vishnu's avatars, are usually blue. Shiva, the Destroyer, is also depicted in light blue tones and is called neela kantha, or blue-throated, for having swallowed poison in an attempt to turn the tide of a battle between the gods and demons in the gods' favour.
• Blue in Judaism: In the Torah,^[11] the Israelites were commanded to put fringes, tzitzit, on the corners of their garments, and to weave within these fringes a "twisted thread of blue (tekhelet)".^[12] In ancient days, this blue thread was made from a dye extracted from a Mediterranean snail called the hilazon. Maimonides claimed that this blue was the colour of "the clear noonday sky"; Rashi, the colour of the evening sky.^[13] According to several rabbinic sages, blue is the colour of God's Glory.^[14] Staring at this colour aids in mediation, bringing us a glimpse of the "pavement of sapphire, like the very sky for purity", which is a likeness of the Throne of God.^[15] (The Hebrew word for glory.) Many items in the Mishkan, the portable sanctuary in the wilderness, such as the menorah, many of the vessels, and the Ark of the Covenant, were covered with blue cloth when transported from place to place.^[16]
• Blue in Islam: In verse 20:102 of the Qur’an, the word زرق zurq (plural of azraq 'blue') is used metaphorically for evildoers whose eyes are glazed with fear, as if the sclera is filmed over with a bluish tint.

Symbolism

• In Thailand, blue is associated with Friday on the Thai solar calendar. Anyone may wear blue on Fridays and anyone born on a Friday may adopt blue as their colour. The Thai language, however, is one that has had trouble distinguishing blue from green. The default word for Blue was recently สีน้ำเงิน literally, the colour of silver, a poetical reference to the silvery sheen of the deep blue sea. It now means Navy Blue, and the default word is now สีฟ้า literally, the colour of the sky.^[17]
• In the early 1960s, the United States Air Force ran a television commercial with this jingle:^[18]

They took the blue from the skies

And the pretty girls' eyes

And a touch of Old Glory too;

And gave it to the men who proudly wear the U. S. Air Force Blue!

Variations

Light blue

Light Blue
— Colour coordinates —
Hex triplet		#ADD8E6
RGBB	(r, g, b)	(173, 216, 230)
HSV	(h, s, v)	(240°, 90%, 80%)
Source		X11
B: Normalized to [0–255] (byte)

The web colour light blue is displayed in the colour box at right. Also could be known as sky blue, baby blue, or angel blue. The first recorded use of "light blue" as a colour term in English is in the year 1915.^[19]

Medium blue

Medium blue
— Colour coordinates —
Hex triplet		#0000CD
RGBB	(r, g, b)	(0, 0, 205)
HSV	(h, s, v)	(240°, 100%, 40%)
Source		X11
B: Normalized to [0–255] (byte)

Displayed at right is the colour medium blue.

Pigment blue

Pigment Blue
— Colour coordinates —
Hex triplet		#333399
RGBB	(r, g, b)	(51, 51, 153)
HSV	(h, s, v)	(240°, 50%, 35%)
Source		CMYK
B: Normalized to [0–255] (byte)

At right is the colour pigment blue. This is the colour that is achieved by mixing an equal amount of process cyan (printer's cyan) and process magenta (printer's magenta).

Dark blue

Dark blue
— Colour coordinates —
Hex triplet		#00008B
RGBB	(r, g, b)	(0, 0, 139)
HSV	(h, s, v)	(240°, 100%, 25%)
Source		X11
B: Normalized to [0–255] (byte)

Dark blue is a shade of blue. The name comes from the word "Dark" (which originated from Old English dark, derk, deork; Anglo-Saxon dearc, and Gaelic and Irish dorch, dorcha) and "Blue" (taken from French and originated from the Indo-European root bhlewos).

Variations of blue in culture

Cartography

• In historical atlases published in Germany, light blue is traditionally used as a colour to represent Germany, as opposed to pink for England, purple for France, and light green for Russia.^[20]

Fashion

• Dark clothing for males such as black, brown, or dark blue business suits have become much more popular since the mid-1990s,^{[citation needed]} as opposed to the pastel coloured business suits worn in the 1970s by major leaders in such institutions as the United States Congress (the vast difference in the clothing worn in the 1970s as opposed to the 2000s can be readily seen by looking at a videotape of the Watergate hearings).

German police officer

Law Enforcement

• In some parts of the world, police wear dark blue or, sometimes, medium blue uniforms.

Human sexuality

• In the bandana code of the gay leather subculture, wearing a medium blue bandana means one is into the fetish of having sex with someone who is wearing a police uniform.^[21]
• In Russian, the word for light blue, голубой, can be used to mean 'homosexual'.^[22]

Sociology

• Dark blue represents knowledge, power, integrity, and seriousness.^{[citation needed]} In Western civilization, those in the upper classes in high places of political or economic power often wear dark blue suits. Ordinary members of the working class (especially those who work in the computer industry) often refer derisively to these management functionaries as the suits.^[23] This terminology is also used in the television industry--the network executives are often referred to by the creative people (actors, directors, and screenwriters) as the suits.^[24]

See also

Look up blue in Wiktionary, the free dictionary.

Wikimedia Commons has media related to: blue

• Blue flag
• Blue movie
• Blue ribbon
• Blue Screen of Death
• Distinguishing "blue" from "green" in language
• Engineer's blue
• Lapis lazuli, a blue stone
• List of colours
• Non-photo blue
• St. Patrick's Blue
• Three Colors: Blue, a film
• Turquoise

References