Cobalt green
Names | |
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Other names
cinnabar green, turquoise green, Rinman's green, Rinmann's green, zinc green
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Identifiers | |
Properties | |
Zn1−xCoxO | |
Insoluble | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Cobalt green is an ambiguous term for either of two families of green inorganic pigments. Both are obtained by doping cobalt(II) oxide into colorless host oxides.
Spinel-based cobalt green
Doping Co(II) into Mg(II) and Zn(II) sites of Mg2TiO4 and Zn2TiO4, respectively gives one family of cobalt greens. These materials adopt the spinel structure.[1]
Rinman's green
Rinman's green, also referred to as Rinmann's green, is obtained by doping cobalt(II) oxide into zinc oxide. Sven Rinman, a Swedish chemist, discovered this compound in 1780. Zinc oxide–derived pigments have been used in many industries and processes. It is rarely used because it is a weak chromophore and relatively expensive compared to chromium(III) oxide.
The structure and color of compositions Zn1−xCoxO depends on the value of x. For x ≤ 0.3, the material adopts the
Cobalt green has been tested for use in "