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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.
The color palette of earth tone typically includes warm and muted shades of brown, green, gray, and beige. Other colors that may be included in the earth tone palette are muted shades of orange, red, and yellow. These colors are inspired by the colors of the earth and can be found in natural materials like clay, sandstone, and rusted metal ...
Umber is a natural earth pigment consisting of iron oxide and manganese oxide; it has a brownish color that can vary among shades of yellow, red, and green. [3]: 39 Umber is considered one of the oldest pigments known to humans, first seen in Ajanta Caves in 200 BC – 600 AD.
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Earth pigments are naturally occurring minerals that have been used since prehistoric times as pigments. Among the primary types of earth pigments include the reddish-brown ochres , siennas , and umbers , which contain various amounts of iron oxides and manganese oxides .
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Sienna (from Italian: terra di Siena, meaning "Earth of Siena") is an earth pigment containing iron oxide and manganese oxide. In its natural state, it is yellowish brown, and it is called raw sienna. When heated, it becomes a reddish brown, and it is called burnt sienna. [2]