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  2. Soil color - Wikipedia

    en.wikipedia.org/wiki/Soil_color

    Gray or blue. Soil in anaerobic, saturated environments may appear gray or blue in color due to the redox reduction and/or depletion of iron. In an anaerobic soils, microbes reduce iron from the ferric (Fe 3+) to the ferrous (Fe 2+) form. Manganese may also be reduced from the manganic (Mn 4+) to the manganous (Mn 2+) form, though iron ...

  3. Chernozem - Wikipedia

    en.wikipedia.org/wiki/Chernozem

    Chernozem (from Russian: чернозём, romanized: chernozyom, IPA: [tɕɪrnɐˈzʲɵm]; "black ground"), [ 1][ 2] also called black soil, regur soil or black cotton soil, is a black-colored soil containing a high percentage of humus [ 3] (4% to 16%) and high percentages of phosphorus and ammonia compounds. [ 4] Chernozem is very fertile ...

  4. Tahitian pearl - Wikipedia

    en.wikipedia.org/wiki/Tahitian_pearl

    Tahitian pearls come in a range of colors from white to black. [2] They can contain various undertones and overtones of green, pink, blue, silver and yellow. The most valuable of these are of the darker variety, as the naturally dark tones of the Tahitian pearls is a unique quality among pearls.

  5. Barro negro pottery - Wikipedia

    en.wikipedia.org/wiki/Barro_negro_pottery

    Barro negro pottery ("black clay") is a style of pottery from Oaxaca, Mexico, distinguished by its color, sheen and unique designs. Oaxaca is one of few Mexican states which is characterized by the continuance of its ancestral crafts, which are still used in everyday life. [ 1] Barro negro is one of several pottery traditions in the state ...

  6. Munsell color system - Wikipedia

    en.wikipedia.org/wiki/Munsell_color_system

    The Munsell color system, showing: a circle of hues at value 5 chroma 6; the neutral values from 0 to 10; and the chromas of purple-blue (5PB) at value 5. In colorimetry, the Munsell color system is a color space that specifies colors based on three properties of color: hue (basic color), value ( lightness ), and chroma (color intensity).

  7. Ceramics of Indigenous peoples of the Americas - Wikipedia

    en.wikipedia.org/wiki/Ceramics_of_indigenous...

    Slip is a liquid clay suspension of mineral pigments applied to the ceramics before firing. Slips are typically red, buff, white, and black; however, Nazca culture ceramic artists in Peru perfected 13 distinct colors of slips. They also used a hand-rotated turntable that allowed all sides of a ceramic piece to be painted with ease.

  8. Natural dye - Wikipedia

    en.wikipedia.org/wiki/Natural_dye

    Natural dye. Naturally dyed skeins made with madder root, Colonial Williamsburg, VA. Natural dyes are dyes or colorants derived from plants, invertebrates, or minerals. The majority of natural dyes are vegetable dyes from plant sources— roots, berries, bark, leaves, and wood —and other biological sources such as fungi. [ 1]

  9. Laterite - Wikipedia

    en.wikipedia.org/wiki/Laterite

    Monument of laterite brickstones at Angadipuram, Kerala, India, which commemorates where laterite was first described and discussed by Buchanan-Hamilton in 1807. Laterite is a soil type rich in iron and aluminium and is commonly considered to have formed in hot and wet tropical areas. Nearly all laterites are of rusty-red coloration, because of ...

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