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  2. Hematite - Wikipedia

    en.wikipedia.org/wiki/Hematite

    Hematite (/ ˈ h iː m ə ˌ t aɪ t, ˈ h ɛ m ə-/), also spelled as haematite, is a common iron oxide compound with the formula, Fe 2 O 3 and is widely found in rocks and soils. [6] Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe

  3. Red pigments - Wikipedia

    en.wikipedia.org/wiki/Red_pigments

    Vermilion pigment Natural red pigments. Red pigments are materials, usually made from minerals, used to create the red colors in painting and other arts. The color of red and other pigments is determined by the way it absorbs certain parts of the spectrum of visible light and reflects the others.

  4. Iron oxide red - Wikipedia

    en.wikipedia.org/wiki/Iron_oxide_red

    Venetian red is a light and warm (somewhat unsaturated) pigment that is a darker shade of scarlet, derived from nearly pure ferric oxide (Fe 2 O 3) of the hematite type. Modern versions are frequently made with synthetic red iron oxide. The first recorded use of Venetian red as a colour name in English was in 1753. [8]

  5. Heliotrope (mineral) - Wikipedia

    en.wikipedia.org/wiki/Heliotrope_(mineral)

    The "classic" bloodstone is translucent to opaque green chalcedony and red jasper that contains inclusions of hematite. The red jasper may resemble spots of blood , hence the name bloodstone . Other colors of chalcedony may also occur in Indian bloodstone, such as white, yellow, or blue.

  6. Sinopia - Wikipedia

    en.wikipedia.org/wiki/Sinopia

    Sinopia (also known as sinoper, named after the now Turkish city Sinop) is a dark reddish-brown natural earth pigment, whose reddish colour comes from hematite, a dehydrated form of iron oxide. It was widely used in Classical Antiquity and the Middle Ages for painting, and during the Renaissance it was often used on the rough initial layer of ...

  7. Iron(III) oxide - Wikipedia

    en.wikipedia.org/wiki/Iron(III)_oxide

    Iron(III) oxide was the most common magnetic particle used in all types of magnetic storage and recording media, including magnetic disks (for data storage) and magnetic tape (used in audio and video recording as well as data storage). Its use in computer disks was superseded by cobalt alloy, enabling thinner magnetic films with higher storage ...

  8. Here’s What Those Colored Circles on Food Packages Actually Mean

    www.aol.com/those-colored-circles-food-packages...

    They compare the color to boxes printed around the world to ensure consistent brand colors,” Schiraldi explained. “Most printers only use four colors: cyan (blue-green), yellow, magenta and black.

  9. Caput mortuum (pigment) - Wikipedia

    en.wikipedia.org/wiki/Caput_mortuum_(pigment)

    Caput mortuum (Latin for 'dead head', and variously spelled caput mortum or caput mortem), also known as cardinal purple, is the name given to a purple variety of hematite iron oxide pigment, used in oil paints and paper dyes. Due to the cultural significance of its deep purple colour, it was very popular for painting the robes of religious ...