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Red ochre takes its reddish colour from the mineral hematite, which is an anhydrous iron oxide, and the main ingredient of rust. It was one of the earliest pigments used by man. Hand prints made by using red ochre have been found in the Pech Merle cave in Southern France. They date to between 16,000 and 25,000 BC.
Red ochre, Fe 2 O 3 ·nH 2 O, takes its reddish colour from the mineral hematite, which is an iron oxide, reddish brown when hydrated. [7] Purple ochre is a rare variant identical to red ochre chemically but of a different hue caused by different light diffraction properties associated with a greater average particle size.
This red is a tone of Indian red, made like Indian red with pigment made from iron oxide. The first recorded use of English red as a color name in English was in the 1700s (exact year uncertain). [10] In the Encyclopédie of Denis Diderot in 1765, alternate names for Indian red included "what one also calls, however improperly, English Red." [11]
Cerium sulfide red (PR265). Iron oxide pigments. Sanguine, Caput mortuum, Indian red, Venetian red, oxide red (PR102). Red ochre (PR102): anhydrous Fe 2 O 3. Burnt sienna (PBr7): a pigment produced by heating raw sienna. Lead pigments. Minium (pigment): also known as red lead, lead tetroxide, Pb 3 O 4. Mercury pigments. Vermilion or cinnabar ...
Food plot in Germany. A food plot is a planted area set aside to act as a supplementary food source for wildlife. The term was coined by the U.S. hunting and outdoor industries and food plots are most commonly planted for game species. Food plot crops generally consist of but are not limited to legumes (clovers, alfalfa, beans, etc.), grains ...
Similarly the Australian Aboriginal people use ochre/letsoku to treat wounds and sores by covering a wound with chewed red ochre and then with leaves. Aqueous ochre is used in any sores on any part of the body and even for internal body pains;here the patient is covered in ochre and placed in the midday sun to provoke sweating thereby healing ...
In 2022 a team of South African and French scientists published a study of otjize's physical properties, concluding that "such a red ochre exhibits an exceptional UV filtration and a significant IR reflectivity substantiating its effectiveness as an effective UV-blocking and solar heat IR reflector in support of the low skin cancer rate within the Namibian Himba community".
[1] [2] Other earth pigments include the green earth pigments or terres vertes, blue earth pigments such as vivianite-based "blue ochre", white earth pigments such as chalk, and black earth pigments such as charcoal. [3] [4] Earth pigments are known for their fast drying time in oil painting, relative inexpensiveness, and lightfastness. Cave ...