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The vivid cyan that is seen on an [[electronics|electronic]] [[display device]] (shown at right) is also referred to as '''electric cyan''' to distinguish it from the less vivid turquoise-like ''process cyan'' used in [[CMYK]] [[color printing]] (shown below). (Note: while the color is defined by definite [[RGB]] values, the display of the color will vary depending on the [[absolute color space]] used and the nature of the physical display device, e.g. computer monitor, and if this page is printed it is likely that the color shown will be far from representative.)
The [[web color]] [[aqua (color)|aqua]] is an alias for electric cyan, that is, it is exactly the same color shown here as electric cyan.
To reproduce electric cyan in inks, it is necessary to add some white ink to the printer's cyan below, so when it is reproduced in printing, it is not a primary subtractive color. It is called '''aqua''' (a name in use since 1598) because it is a color commonly associated with [[water]], such as the appearance of the water at a tropical beach.<ref> Maerz and Paul ''The Dictionary of Color'' 1930 (see under Aqua in Index, Page 189)</ref>
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===Process cyan (pigment cyan) (printer's cyan)===
{{infobox color|
title= Cyan (субтрактивний, первинний)|
hex= 00B7EB|
r= 0|g=180|b=247|
c=100|m=0|y=0|k=0|
h=180|s=100|v=97<ref>Using [[HSL color space#Conversion from RGB to HSL or HSV]], v=247/255</ref>
|source=<!-- tintbook does not tell me any of this: --> [[CMYK]]<ref> [http://www.tintbook.com/ Tintbooks - Get Accurate CMYK Color Results For Your Printing Projects CMYK color tintbook:]</ref>}}
Cyan is also one of the common inks used in [[four-color printing]], along with [[magenta]], [[yellow]], and [[black]]; this set of colors is referred to as [[CMYK]].
While both the additive secondary and the subtractive primary are called ''cyan'', they can be substantially different from one another. Cyan printing ink can be more saturated or less saturated than the RGB secondary cyan, depending on what [[RGB color space]] and ink are considered.
Process cyan 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 cyan ink. A typical formulation of ''process cyan'' is shown in the color box at right. The source of the color shown at right is the color cyan that is shown in the diagram located at the bottom of the following Web site offering tint books for CMYK printing: http://www.tintbook.com/
==Variations of cyan==
===Light sea green===
{{infobox color|
title= Light Sea Green|
hex= 20B2AA|
r= 32|g=178|b=170|
c= |m= |y= |k= |
h=175|s= 40|v= 75
|source=[[Web color#X11 color list|X11]]}}
Displayed at right is the web color '''light sea green'''.
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===Dark cyan===
{{infobox color|
title= Dark Cyan|
hex= 008B8B|
r= 0|g=139|b=139|
c= |m= |y= |k= |
h=180|s= 24|v= 100
|source=[[Web color#X11 color list|X11]]}}
Displayed at the right is the web color '''dark cyan'''.
{{-}}
==Cyan in nature==
* Pure water is nearly colorless. However, it does [[water absorption|absorb]] slightly more red light than blue, giving large volumes of water a bluish tint; increased scattering of blue light due to fine particles in the water shifts the blue color toward green, for a typically cyan net color.<ref>{{cite book | title = Clouds in a Glass of Beer: Simple Experiments in Atmospheric Physics | author = Craig F. Bohren | publisher = Courier Dover Publications | year = 2001 | isbn = 0486417387 | url = http://books.google.com/books?id=CZuNCZqtZZUC&pg=PA156&dq=absorption+scattering+water+blue+red&lr=&as_brr=3&ei=a684ScHhGI3WlQTM-_W7Bg }}</ref>
* [[Cyanobacteria]] (sometimes called blue-green algae) are an important link in the [[food chain]].
* [[Cyanide]] derives its name from [[Prussian blue]], a blue pigment containing the cyanide ion.
==Cyan in human culture==
{{Refimprove|date=March 2007}}
===[[Architecture]]===
* Cyan colored [[tile]]s are often used to pave [[swimming pool]]s to make the water within them seem more inviting to swim in, by making the cyan color of their water seem more intensely colored. Water in swimming pool is colored a bright tint of cyan anyway because [[chlorine bleach]], which is cyan, is added to water in swimming pools for disinfection.
===[[Astronomy]]===
* The [[planet]] [[Uranus]] is cyan because of the abundance of [[methane]] in its [[atmosphere]].
===[[Personal computer game|Computer games]]/[[video game]]s===
* There is a [[computer game]] company called [[Cyan Worlds]] (a.k.a., [[Cyan, Inc.]]).
* There is a ''[[Final Fantasy VI]]'' character named [[Cyan Garamonde]].
* Inky, one of the four ghost in [[Pac-Man]], is a shade of cyan.
===[[Energy]]===
* [[Natural gas]] ([[methane]]), used by many for [[home cooking]] on [[gas stove]]s, when burned has a cyan colored [[flame]].
===[[Film]]===
*A silverless dye track used for soundtracks on 35mm film stock. Red light readers are required to read cyan soundtracks. [http://www.dyetracks.org/].
===[[Interior design]] and [[industrial design]]===
* The color cyan (called ''aqua'' by [[interior designer]]s) was commonly used in the [[interior design]] of the 1950s in combination with either [[magenta]] or [[pink]] and [[black]] to give a [[modern architecture|modern]] feel to interiors (these colors were also popular for [[automobile]]s in the 1950s).
===[[Medical]]===
* [[Cyanosis]] is an abnormal blueness of the skin, usually a sign of poor oxygen intake. i.e the patient is "cyanotic".
===[[Music]]===
* There is a band called [[Cyan (band)|Cyan]], a [[United Kingdom|British]] [[progressive rock]] band from the 1980s and 1990s.
===[[Panelology]]===
* ''Cyan'' is the name of a character in the [[Norway|Norwegian]] comic strip [[Nemi (comic strip)|Nemi]].
===[[Photography]]===
* [[Cyanotype]], or blueprint, a [[monochrome]] [[photographic process|photographic printing process]] that predates the use of the word ''cyan'' as a color, yields a deep ''cyan-blue'' colored print based on the [[Prussian blue]] pigment.<ref>{{cite book | title = Cyanotype: the history, science and art of photographic printing in Prussian blue | author = Mike Ware | url = http://books.google.com/books?id=C-7I69gFIbMC&pg=PA21&ots=alsMw9t0Kr&dq=cyanotype+prussian-blue+color&sig=s12O6C39teka_vg41EDxbflKMI4#PPA40,M1 | publisher = NMSI Trading Ltd | year = 1999 | isbn = 1900747073 }}</ref>
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== Див. також ==
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