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| |
| Names | |
|---|---|
| IUPAC name
copper hydrogen arsenite
| |
| Other names
Copper arsenite
Copper arsenate Swedish Green Cupric Green | |
| Identifiers | |
3D model (JSmol)
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|
| ChemSpider | |
| ECHA InfoCard | 100.030.573 |
PubChem CID
|
|
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).
| |
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]
https://en.wikipedia.org/wiki/Scheele%27s_Green
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