A clear, bright green, synthetic pigment composed of copper acetoarsenite. Emerald green was discovered about 1800 and first commercially manufactured in Schweinfurt Germany in 1814. It is extremely poisonous. Emerald green is lightfast but is decomposed by acids and warm alkalis and darkens in the presence of sulfur. Emerald green was used in the 19th century for oil paints, coach paints, watercolors, pastels, wax crayons and pencils. In the early 20th century, it was also used as a colorant in wallpapers, fabrics, linoleum, and toys. Marketed as Paris green, it was used as an insecticide, fungicide, and rat poison. Emerald green is no longer used as a pigment due to its toxicity. The name emerald green is not standardized and has also been used for chrome oxide greens and synthetic dyes. Another green copper-arsenic pigment is copper arsenite (Scheele's green).
Synonyms and Related Terms
copper acetoarsenite; Pigment Green 21; CI 77410; vert cendre (Fr.); vert Véronèse (Fr.); verde ceniza (Esp.); verde esmeralda (Esp.); Deckgrun (Deut.); Schweinfurter Grünn (Deut.); prasino Emerald (Gr.); verde di Schweinfurt (It.); verde di Parigi (It.), schweinfurter Groen (Ned.); verde esmeralda (Port.); cupric acetoarsenite; copper acetate arsenite; king's green; Paris green; Schweinfurt green; mineral green; imperial green; Mitis green; parrot green; Vienna green; new green; patent green; Emperor green; Kaiser green; meadow green; English green;
Soluble in mineral acids. Insoluble in water. Decomposes in alkalis. Darkens in the presence of sulfur or lead compounds.
Small rounded grains with radial structure and dark spot in the middle. High birefringence.
|Molecular Weight||mol. wt. = 1013.8|
|Refractive Index||1.71(alpha); 1.78(beta)|
Hazards and Safety
Extremely toxic; human carcinogen. Skin contact may cause irritation, ulceration and cancer. Ingestion may be fatal.
° I.Fiedler, M Bayard, "Emerald Green and Scheele's Green", Artists Pigments, Volume 3, E. West FitzHugh (ed.), Oxford University Press: Oxford, 1997. ° Pigments Through the Ages: Emerald green
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- Website address 1 Comment: Pigments Through the Ages: http://webexhibits.org/pigments/indiv/overview/emerald.html ref index: alpha = 1.71-2, beta = 1.77-8