Ochre

Ochre

Color coordinates
Hex triplet		#CC7722
RGB	(r, g, b)	(204, 119, 34)
CMYK	(c, m, y, k) N	(0, 85, 170, 50)
HSV	(h, s, v)	(30°, 83%, 80%)
	N: Normalised to [ 0–255 ] (changing to [0–100])

This article is about the color. For other uses, see Ochre (disambiguation).

Ochre or Ocher (pronounced OAK-ur, from the Greek ochros, yellow) is a color, usually described as golden-yellow or light yellow brown.

Contents 1 Pigment 2 See also 3 External links 4 References

Pigment

Image:Pigment goethite iconofile.jpg

As a painting pigment it exists in at least four forms:

• Yellow ochre, Fe₂O₃ • H₂O, 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 diffrent 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.

See also

• Clay earth pigment
• List of colors

External links

• Red Ochre, Yellow ochre, and Brown ochre, from Pigments through the ages

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.bg:Охра

da:Okker de:Ocker es:Ocre eo:Okra fr:Ocre it:Ocre lt:Ochra nl:Gele oker pl:Ocre pt:Ocre ru:Охра sv:Ockra