Used as a catalyst in organic synthesis, particularly in coupling reactions such as the Ullmann reaction, where it facilitates the formation of carbon-oxygen and carbon-nitrogen bonds. Employed in the preparation of other copper-based compounds and coordination complexes due to its stability and reactivity. Acts as a wood preservative by inhibiting fungal and insect damage. Utilized in textile dyeing processes as a mordant to fix dyes on fabrics. Applied in pyrotechnics to produce blue-green flames. Also found in some agricultural formulations as a fungicide and in industrial settings as a corrosion inhibitor.