Paris green

Paris green

Paris green
Other names
C.I. pigment green 21, emerald green, Schweinfurt green, imperial green, Vienna green, Mitis green, Veronese green[1]
Jmol-3D images Image
UN number 1585
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 soluble but unstable in acids
insoluble in alcohol
Safety data sheet CAMEO MSDS
Toxic T Dangerous for the Environment (Nature) N
R-phrases 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[2]
REL (Recommended)
Ca C 0.002 mg/m3 [15-minute][2]
Ca [5 mg/m3 (as As)][2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 N  (: Y/N?)
Paris green
    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 []
B: Normalized to [0–255] (byte)
H: Normalized to [0–100] (hundred)

Paris green (copper(II) acetate triarsenite) is an

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

External links

  • Fiedler, I. and Bayard, M.A., Emerald Green and Scheele’s Green, in Artists’ Pigments, A Handbook of Their History and Characteristics, Vol 3: E.W. Fitzhugh (Ed.) Oxford University Press 1997, p. 219 – 271

Further reading

  1. ^ "Health & Safety in the Arts -- Painting & Drawing Pigments". Environmental Management Division, City of Tucson AZ. Retrieved 2011-02-07. 
  2. ^ a b c "NIOSH Pocket Guide to Chemical Hazards #0038".  
  3. ^ "Hazardous Substance Fact Sheet" (PDF). NJ Dept. of Health and Senior Services. Retrieved 2011-02-07. 
  4. ^ "How to Use Copper in Pyro Star Compositions to Create Blue Fireworks Stars". Skylighter. Retrieved 2011-02-07. 
  5. ^ "H.Wayne Richardson, "Copper Compounds" in Ullmann's Encyclopedia of Industrial Chemistry 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a07_567
  6. ^ The Natural Paint Book, by Lynn Edwards,Julia Lawless, Table of contents
  7. ^ Justin M. Andrews, Sc. D. (1963). "Preventive Medicine in World War II, Chapter V. North Africa, Italy, and the Islands of the Mediterranean". Washington, D.C. USA: Office of the Surgeon General, Department of the Army. p. 281. Retrieved 2008-09-30. 
  8. ^ Emerald green, Colourlex


Illustrations of Paris green
Paris green pigment 
Mixing "Paris green" and road dust preparatory to dusting streams and breeding places of mosquitoes during World War II 
Use as insecticide, poster issued by US Public Health Service 


See also

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.

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 molds, 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.

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.

Related pigments

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.[8]


Paris green was once used to kill rats in Parisian sewers, hence the common name.[6] 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.[7]



Paris green may be prepared by combining copper(II) acetate and arsenic trioxide.[5]



  • Preparation 1
  • Uses 2
    • Insecticide 2.1
    • Pigment 2.2
      • Related pigments 2.2.1
  • See also 3
  • Gallery 4
  • References 5
  • Further reading 6
  • External links 7

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. [4], and also as a pigment, despite its toxicity. It is also used as a blue colorant for fireworks.insecticide and rodenticide that has been used as a [3]