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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 ...
Ochre. Ochre ( / ˈoʊkər / 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. [ 1] It ranges in colour from yellow to deep orange or brown. It is also the name of the ...
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 ...
Black-on-black ware is produced with a smooth surface, with the designs applied through selective burnishing or the application of refractory slip. The clay body used in this type of pottery has a very fine grain structure. Both types are typically made using traditional methods of hand-coiling local clay and firing it in a pit.
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]
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).
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 ...
Umber is a natural brown pigment extracted from clay containing iron, manganese, and hydroxides. [ 11] Umber has diverse hues, ranging from yellow-brown to reddish-brown and even green-brown. The color shade varies depending on the proportions of the components. When heated, umber becomes a more intense color and can look almost black.
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