Used as a colorimetric reagent for the detection and quantification of copper ions in various samples, including water, biological fluids, and industrial solutions. It forms a stable complex with copper, producing a distinct color change that can be measured spectrophotometrically. This property makes it valuable in environmental monitoring, quality control, and analytical chemistry. Additionally, it is employed in research laboratories for studying metal ion interactions and chelation processes. Its specificity for copper allows for accurate and sensitive analysis in complex matrices.