Paris green

a poisonous, bright-green powder made by reacting sodium arsenite with copper sulfate and acetic acid: used chiefly as an insecticide

Origin: after Paris

See Paris green in American Heritage Dictionary 4

noun

A poisonous emerald-green powder, C₄H₆As₆Cu₄O₁₆, used as a pigment, insecticide, and wood preservative.

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