Used as a sensitive metal ion indicator in complexometric titrations, particularly for the detection of trivalent metal ions such as aluminum, iron, and chromium. It is especially effective in EDTA titrations where it provides a sharp color change from yellow to red or violet upon metal ion binding. Commonly applied in water hardness testing and in analytical chemistry for the determination of metal contaminants in environmental and industrial samples. Also utilized in biochemical assays where metal ion chelation is monitored. The solution form allows for easy dispensing and consistent results in titration procedures.