Ochre or Ocher (pronounced //, from the Greek ?????, yellow) is a color, usually described as golden-yellow or light yellow brown. Pigment 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 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, Fran

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