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.

noun

1. 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(AsO 2) 2 .Cu(C 2 H 3 O 2) 2