Paris green

Paris green

Names
Other names C.I. pigment green 21, emerald green, Schweinfurt green, imperial green, Vienna green, Mitis green, Veronese green
Identifiers
CAS Number	12002-03-8 Y
3D model (Jmol)	Interactive image
ECHA InfoCard	100.125.242
PubChem CID	22833492
UN number	1585
InChI InChI=1S/2C2H4O2.6AsHO2.4Cu/c2*1-2(3)4;6*2-1-3;;;;/h2*1H3,(H,3,4);6*(H,2,3);;;;/q;;;;;;;;4*+2/p-8 Key: HTSABAUNNZLCMN-UHFFFAOYSA-F
SMILES CC(=O)[O-].CC(=O)[O-].[O-][As]=O.[O-][As]=O.[O-][As]=O.[O-][As]=O.[O-][As]=O.[O-][As]=O.[Cu+2].[Cu+2].[Cu+2].[Cu+2]
Properties
Chemical formula	Cu(C2H3O2)2·3Cu(AsO2)2
Molar mass	1013.79444 g/mol
Appearance	Emerald green crystalline powder
Density	>1.1 g/cm3 (20 °C)
Melting point	>345 °C
Boiling point	decomposes
Solubility in water	insoluble
Solubility	soluble but unstable in acids insoluble in alcohol
Hazards
Safety data sheet	CAMEO MSDS
EU classification (DSD)	T N
R-phrases	R23/25 R50/53
S-phrases	(S1/2) S20/21 S28 S45 S60 S61
Lethal dose or concentration (LD, LC):
LD50 (median dose)	22 mg/kg
US health exposure limits (NIOSH):
PEL (Permissible)	[1910.1018] TWA 0.010 mg/m3
REL (Recommended)	Ca C 0.002 mg/m3 [15-minute]
IDLH (Immediate danger)	Ca [5 mg/m3 (as As)]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Paris green
Color coordinates
Hex triplet	#50C878
sRGBB  (r, g, b)	(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 or copper(II) acetoarsenite) is an inorganic compound. It is a highly toxic emerald-green crystalline powder 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. The color of Paris green is said to range from a pale blue green when very finely ground, to a deeper green when coarsely ground.

Paris green may be prepared by combining copper(II) acetate and arsenic trioxide.

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 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.

Paris green, also called emerald green, was a popular pigment used in artists' paints by (among others) the English painter W. Turner, Impressionists such as Monet and Renoir and Post-Impressionists such as Gauguin, Cézanne and Van Gogh.

Similar natural compounds are the minerals chalcophyllite Cu
18Al
2(AsO
4)
3(SO
4)
3(OH)
27·36H
2O, conichalcite CaCu(AsO
4)(OH), cornubite Cu
5(AsO
4)
2(OH)
4·H
2O, cornwallite Cu
5(AsO
4)
2(OH)
4·H
2O, and liroconite Cu
2Al(AsO
4)(OH)
4·4H
2O. These vivid minerals range from greenish blue to slightly yellowish green.