Paris green

Paris green

noun
1.
Chemistry. an emerald-green, poisonous, water-insoluble powder produced from arsenic trioxide and copper acetate: used chiefly as a pigment, insecticide, and wood preservative.
2.
(sometimes lowercase) a variable hue ranging from light to vivid yellow green in color.

Origin:
1870–75

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World English Dictionary
Paris green
 
n
an emerald-green poisonous insoluble substance used as a pigment and insecticide. It is a double salt of copper arsenite and copper acetate. Formula: 3Cu(AsO2)2.Cu(C2H3O2)2

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