geology - OCHRE

Jun 28th, 2015
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Ochre or Ocher (pronounced /ˈoʊkər/ OH-kər, from the Greek ὠχρός, yellow) is term for both a golden-yellow or light yellow brown color and for a form of earth pigment which produces the color. The pigment can also be used to create a reddish tint known as Red ochre.

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OCHREOchre or Ocher (pronounced /?o?k?r/ OH-k?r, from the Greek ?????, yellow) is term for both a golden-yellow or light yellow brown color and for a form of earth pigment which produces the color. The pigment can also be used to create a reddish tint known as Red ochre. The more rarely used terms Purple ochre and Brown ochre also exist for variant hues. Because of these other hues, the color Ochre is sometimes referred to as Yellow ochre.Ochres are among the earliest pigments used by mankind, derived from naturally tinted clay containing mineral oxides. Chemically, it is hydrated iron (III) oxide. Modern artists's pigments continue to use the terms Yellow ochre and Red ochre for specific hues.PigmentOchres are non-toxic, and can be used to make an oil paint that dries quickly and covers surfaces thoroughly. To manufacture ground ochre, ochre clay is first mined from the ground.

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