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Encyclopedia > Ochre
Ochre
— Color coordinates —
Hex triplet #CC7722
RGBB (r, g, b) (204, 119, 34)
CMYKH (c, m, y, k) (0, 42, 83, 20)
HSV (h, s, v) (30°, 83%, 80%)
B: Normalized to [0–255] (byte)
H: Normalized to [0–100] (hundred)

Ochre or Ocher (pronounced /'əʊk.ə/, from the Greek ochros, yellow) is a color, usually described as golden-yellow or light yellow brown. Authors of web pages have a variety of options available for specifying colors for elements of web documents. ... The RGB color model utilizes the additive model in which red, green and blue light are combined in various ways to create other colors. ... Red is any of a number of similar colors at the lowest frequencies of light discernible by the human eye. ... Green is any of a number of similar colors. ... Blue is any of a number of similar colors. ... Cyan, magenta, yellow, and key (black) CMYK (or sometimes YMCK) is a subtractive color model used in color printing. ... Cyan is a pure spectral color, but the same hue can also be generated by mixing equal amounts of green and blue light. ... Magenta is a color that is not a spectral color: that is to say, the hue cannot be generated by light of a single wavelength. ... Yellow is any of a number of similar colors with a wavelength of 565-590 nanometers. ... BLACK is a first-person shooter for PlayStation 2 and Xbox, developed by Criterion Software and published by Electronic Arts. ... The HSV (Hue, Saturation, Value) model, also called HSB (Hue, Saturation, Brightness), defines a color space in terms of three constituent components: HSV color space as a color wheel Hue, the color type (such as red, blue, or yellow): Ranges from 0-360 (but normalized to 0-100% in some... e gradation of color; for the city in Vietnam, see Huế. A hue refers to the gradation of color within the optical spectrum, or visible spectrum, of light. ... Scale of saturation (0% at bottom). ... Brightness is an attribute of visual perception in which a source appears to emit a given amount of light. ... Ochre may be: Ochre, the golden-yellow color. ... ...

Contents


Pigment

Goethite (brown ochre)
Goethite (brown ochre)

As a painting pigment it exists in at least four forms: Goethite (brown ochre) From an email dated Wed, 31 Mar 2004 21:25:29 -0800: You can use the images of pigments as long as you give full credit to Iconofile and the web site. ... Goethite (brown ochre) From an email dated Wed, 31 Mar 2004 21:25:29 -0800: You can use the images of pigments as long as you give full credit to Iconofile and the web site. ... The examples and perspective in this article or section may not represent a worldwide view. ... In biology, pigment is any material resulting in color in plant or animal cells which is the result of selective absorption. ...

  • Yellow ochre, Fe2O3H2O, a hydrated Iron oxide
  • Red ochre, Fe2O3, chemically identical to yellow ochre, but reddened through heating
  • Purple ochre, identical to red ochre chemically but of a different hue caused by different light diffraction properties associated with a greater average particle size
  • Brown ochre (Goethite), also partly hydrated iron oxide (rust)

For further information, see the articles on the individual ochres. They are found throughout the world in many shades. Many sources consider the best brown ochre to come from Cyprus, and the best yellow and red ochre from Roussillon, France. All have been used since prehistoric times, and are some of oldest pigments used. Red ochre and yellow ochre (pronounced OAK-ur, from the Greek ochros, yellow) are pigments made from naturally tinted clay. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals Group, Period, Block 16, 2, p Appearance colorless Atomic mass 15. ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals Group, Period, Block 16, 2, p Appearance colorless Atomic mass 15. ... Hydrates are compounds formed by the union of water with some other substance, generally forming a neutral body, as certain crystallized salts. ... Iron oxide pigment There are a number of iron oxides: Iron oxides Iron(II) oxide or ferrous oxide (FeO) The black-coloured powder in particular can cause explosions as it readily ignites. ... Red ochre and yellow ochre (pronounced OAK-ur, from the Greek ochros, yellow) are pigments made from naturally tinted clay. ... Goethite is a iron bearing oxide mineral found in soil and other low temperature enviroments. ... Iron oxide pigment There are a number of iron oxides: Iron oxides Iron(II) oxide or ferrous oxide (FeO) The black-coloured powder in particular can cause explosions as it readily ignites. ... Rusted cars The rusting can completely eat away iron Rusted bolt A blacksmith removing rust with sand prior to welding Rust is the substance formed when iron compounds corrode in the presence of oxygen and water. ... Roussillon is a village and commune in the Vaucluse département of southern France. ...


Industry

When the mineral was found in Brixham It became a very important part of the developing Fishing Industry. This gave the old fishing boats their "Red Sails in the Sunset", but the purpose was to protect the canvas from seawater, not to be picturesque. It was boiled in great caldrons, together with tar, tallow and oak bark, the last ingredient giving the name of barking yards to the places where the hot mixture was painted on to the sails, which were then hung up to dry. Location within the British Isles Brixham is a small town in the county of Devon in the southwest of England. ... Red Sails in the Sunset is an album by Midnight Oil that was released in 1984 under the CBS record label. ... This article is about the black liquid. ... Tallow is rendered beef or mutton fat, which was originally suet. ... Species See List of Quercus species The term oak can be used as part of the common name of any of several hundred species of trees and shrubs in the genus Quercus, and some related genera, notably Cyclobalanopsis and Lithocarpus. ...


The ochre was also used to make a very special paint. This was invented in Brixham in about 1845 and was the first substance in the world that would stop cast iron from rusting. None of the well-known scientists of the day could find a way of doing this, and, when the paint began to be made here, it sold all round the globe


See also

Clay earth pigments are naturally occurring minerals that have been used since prehistoric times as pigments. ... The following is a partial list of colors with associated articles. ...

External links

References

  • Fuller, Carl; Natural Colored Iron Oxide Pigments, pp. 281-6. In: Pigment Handbook, 2nd Edition. Lewis, P. (ed.). New York: John Wiley & Sons, 1988.
  • Thomas, Anne Wall. Colors From the Earth, New York: Van Nostrand Reinhold, 1980.

 
 

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