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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.
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.
14th-century gold-ground Italian painting where the gold leaf has worn away to reveal the red bole beneath. Bole is a shade of reddish brown. The color term derives from Latin bōlus (or dirt) and refers to a kind of soft fine clay whose reddish-brown varieties are used as pigments, and as a coating in panel paintings and frames underneath the paint or gold leaf.
This is an accepted version of this page This is the latest accepted revision, reviewed on 6 February 2025. Colors are an important part of visual arts, fashion, interior design, and many other fields and disciplines. The following is a list of colors. A number of the color swatches below are taken from domain-specific naming schemes such as X11 or HTML4. RGB values are given for each swatch ...
Clay is a type of fine-grained natural soil material containing clay minerals [1] (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 4).
The color has resisted chemical solvents and acids such as nitric acid. Its resistance against chemical aggression (acids, alkalis , solvents , etc.) and biodegradation was tested, and it was shown that Maya blue is an extremely resistant pigment, but it can be destroyed using very intense acid treatment under reflux .
When heated, the limonite and goethite is dehydrated and turns partially to hematite, which gives it a reddish-brown color. [7] Sienna is lighter in shade than raw umber, which is also clay with iron oxide, but which has a significantly higher content of manganese (5 to 20 percent) making it greenish brown or dark brown in color.
hexadecimal triplet for the sRGB colour space, approximating the given RAL colour; sRGB value; Grey value calculated from (0.2126 × red) + (0.7152 × green) + (0.0722 × blue) [12] CIE L*a*b* values; sRGB value expressed as hue, saturation and lightness (HSL) device-independent CMYK value: cyan, magenta, yellow, black or key