In 1867, the pigment was named Paris green and was officially recognized as the first chemical insecticide in the world.

Paris green (copper(II) acetate triarsenite or copper(II) acetoarsenite) is an arsenic- and copper-containing pigment. It is an emerald-green crystalline powder that is also known as Mitis green, Schweinfurt green, Sattler green, emerald green, Vienna green, emperor green or mountain green. It is highly toxic[5] and has thus also been used as a rodenticide and insecticide.[6] Its formula is Cu(C2H3O2)2·3Cu(AsO2)2.[7]