Scheele's green
Highly toxic arsenic-based pigment / From Wikipedia, the free encyclopedia
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Scheele's green, also called Schloss green, is chemically a cupric hydrogen arsenite (also called copper arsenite or acidic copper arsenite), CuHAsO
3. It is chemically related to Paris green. Scheele's green was invented in 1775 by Carl Wilhelm Scheele.[2][3] By the end of the 19th century, it had virtually replaced the older green pigments based on copper carbonate. It is a yellowish-green pigment commonly used during the early to mid-19th century in paints as well as being directly incorporated into a variety of products as a colorant.[4] It began to fall out of favor after the 1860s because of its toxicity and the instability of its color in the presence of sulfides and various chemical pollutants.[5] The acutely toxic nature of Scheele's green as well as other arsenic-containing green pigments such as Paris green may have contributed to the sharp decline in the popularity of the color green in late Victorian society.[5] By the dawn of the 20th century, Scheele's green had completely fallen out of use as a pigment but was still in use as an insecticide into the 1930s.[6][7] At least two modern reproductions of Scheele's green hue with modern non-toxic pigments have been made, with similar but non-identical color coordinates: one with hex#3c7a18 (RGB 60, 122, 24) and another with hex#478800 (RGB 71, 136, 0).[8][9] The latter is the more typically reported color coordinate for Scheele's green.[10]
Names | |
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IUPAC name
copper hydrogen arsenite | |
Other names
Copper arsenite Copper arsenate Swedish green Cupric green | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.030.573 |
PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |
AsCuHO3 | |
Molar mass | 187.474 |
Hazards | |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
[1910.1018] TWA 0.010 mg/m3[1] |
REL (Recommended) |
Ca C 0.002 mg/m3 [15-minute][1] |
IDLH (Immediate danger) |
Ca [5 mg/m3 (as As)][1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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