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Emerald green

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Emerald green

"Emerald green" redirects here. For the color, see emerald (color). For the Boardwalk Empire episode, see Paris Green (Boardwalk Empire).
Paris Green
Identifiers
CAS number 12002-03-8 YesY
UN number 1585
Properties
Molecular formula Cu(C2H3O2)2·3Cu(AsO2)2
Hazards
MSDS CAMEO MSDS
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references
Paris Green
About these coordinates     Color coordinates
Hex triplet #50C878
sRGBB  (rgb) (80, 200, 120)
CMYKH   (c, m, y, k) (60, 0, 40, 22)
HSV       (h, s, v) (140°, 60%, 78%)
Source [Unsourced]
B: Normalized to [0–255] (byte)
H: Normalized to [0–100] (hundred)

Paris Green (copper(II) acetate triarsenite) is an inorganic compound more precisely known as copper(II) acetoarsenite. It is a highly toxic emerald-green crystalline powder[2] that has been used as a rodenticide and insecticide, and also as a pigment, despite its toxicity. It is also used as a blue colorant for fireworks.[3] The color of Paris Green is said to range from a pale, but vivid, blue green when very finely ground, to a deeper true green when coarsely ground.

Preparation

Paris Green may be prepared by combining copper(II) acetate and arsenic trioxide.[4]

Uses

Insecticide

Paris Green was once used to kill rats in Parisian sewers, hence the common name. It was also used in America and elsewhere as an insecticide for produce, such as apples, around 1900, where it was blended with lead arsenate. This quite toxic mixture is said "to have burned the trees and the grass around the trees". Paris Green was heavily sprayed by airplane in Italy, Sardinia, and Corsica during 1944 and in Italy in 1945 to control malaria.[5]

Pigment

Paris Green was once a popular pigment used in artists' paints.

Related pigments

Similar natural compounds are the minerals chalcophyllite Cu18Al2(AsO4)3(SO4)3(OH)27·36(H2O), conichalcite CaCu(AsO4)(OH), cornubite Cu5(AsO4)2(OH)4·(H2O), cornwallite Cu5(AsO4)2(OH)4·(H2O), and liroconite Cu2Al(AsO4)(OH)4·4(H2O). These vivid minerals range from greenish blue to slightly yellowish green.

Scheele's green is a chemically simpler, less brilliant, and less permanent, synthetic copper-arsenic pigment used for a rather short time before Paris Green was first prepared, which was approximately 1814. It was popular as a wallpaper pigment and would degrade, with moisture and moulds, to arsine gas. Paris Green may have also been used in wallpaper to some extent and may have also degraded similarly. Both pigments were once used in printing ink formulations.

The ancient Romans used one of them, possibly conichalcite, as a green pigment. The Paris Green paint used by the Impressionists is said to have been composed of relatively coarse particles. Later, the chemical was produced with increasingly small grinds and without carefully removing impurities; its permanence suffered. It is likely that it was ground more finely for use in watercolors and inks, too.

See also

  • List of colors

References

External links

  • Case Studies in Environmental Medicine - Arsenic Toxicity
  • How Emerald green is made
  • National Pollutant Inventory - Copper and compounds fact sheet
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