High Quality Content by WIKIPEDIA articles! Copper(II) acetate, also referred to as cupric acetate, is the chemical compound with the formula Cu(OAc)2 where OAc is acetate (CH3CO2). The hydrated derivative, which contains one molecule of water for each Cu atom, is available commercially. Cu(OAc)2 is a dark green crystalline solid, whereas Cu(OAc)2(H2O)2 is more bluish-green. Since ancient times, copper acetates of some form have been used as fungicides and green pigments. Today, Cu(OAc)2 is used as a source of copper(II) in inorganic synthesis and as a catalyst or an oxidizing agent in organic synthesis. Copper acetate, like all copper compounds, emits a blue-green glow in a flame.