Classification: Dicopper oxide is a harmful product that must be used with caution: it may cause sensitisation by skin contact. 

Classification: Copper oxide black is dangerous if swallowed or inhaled. 

Uses: Copper(II) oxide, not to be confused with copper(I) oxide is the oxidized form of metallic copper. Copper monoxide is applied in different markets: feed industry as oligo-element, catalyst, raw material for pigments and metal surface treatment.

Classification: Copper hydroxide is harmful if swallowed; may cause serious damage to eyes; is toxic to aquatic organisms and may cause long-term adverse effects to aquatic environments.