Used as a sensitive metal ion indicator in complexometric titrations, particularly for detecting trivalent metal ions such as aluminum, iron, and chromium. It forms highly colored complexes with these metals, showing a distinct color change from yellow to red or violet at the endpoint. Commonly applied in EDTA titrations where precise detection of metal ion concentration is required. Also used in analytical chemistry for qualitative and quantitative analysis of metal contaminants in environmental and industrial samples. Suitable for use in slightly acidic to neutral pH ranges, making it ideal for specific metal recovery processes and water quality testing.