Neocuproine hydrochloride monohydrate is used to detect copper via spectrophotometry. A compound used to detect copper.Neocuproine hydrochloride monohydrate has been used in measuring copper dissolution in Cu–Ni alloys using colorimetric method. It has also been used in preparing complexing agent solution in studying the antioxidant capacity assays in biological samples based on Cu reducing complexes. It may be used as a precursor for the preparation of neocuproine, used as an analytical reagent for the determination of copper in environmental samples using spectrophotometric technique. Neocuproine hydrochloride monohydrate has been used in measuring copper dissolution in Cu–Ni alloys using colorimetric method. It has also been used in preparing complexing agent solution in studying the antioxidant capacity assays in biological samples based on Cu reducing complexes.