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Ochre (/ ˈ oʊ k ər / OH-kər; from Ancient Greek ὤχρα (ṓkhra), from ὠχρός (ōkhrós) 'pale'), iron ochre, or ocher in American English, is a natural clay earth pigment, a mixture of ferric oxide and varying amounts of clay and sand. [2] It ranges in colour from yellow to deep orange or brown.
Golden ochre is one of the oldest paints, known as a painting material since the times of cave paintings. In wall painting it is one of the main yellow pigments. Golden ochre has good density, the same covering power, high light fastness, pure color and soft structure. To this day it is used in all painting techniques without exception.
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The English name of the stone is derived from Middle French hématite pierre, which was taken from Latin lapis haematites c. the 15th century, which originated from Ancient Greek αἱματίτης λίθος (haimatitēs lithos, "blood-red stone"). Ochre is a clay that is colored by varying amounts of hematite, varying between 20% and 70%. [9]
Iron ochre or iron ocher (Ancient Greek: ὠχρός, pale yellow, orange) refers to at least three iron ore minerals, [1]: 134 common abrasives and pigments with a red-brown or brown-orange hue and the powdery consistency of ocher, were known under such a trivial name. The term “iron ocher” was primarily used among mineral collectors ...
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In the mineralogical sense of the word, antimony ochres are a loosely defined group of secondary antimony minerals of the oxide and hydroxide class. The most common antimony ochres are cervantite, romeite, and stibiconite, [1]: 330 but their number is by no means exhaustive. At various times, this conditional list also included other names ...
Goethite is an important component of ochre pigments, [21] and has been heat-treated for use as a red pigment since Paleolithic times. [22] Iron-rich lateritic soils that have developed over serpentinite rocks in tropical climates are mined for their iron content, as well as other metals.