Used primarily as a reagent in analytical chemistry, it detects the presence of barium, lead, and other heavy metals in various samples. In forensic science, it is applied to identify gunshot residue by reacting with lead particles. It also serves as a colorimetric indicator in chemical analyses, changing color in the presence of specific ions. Additionally, it is utilized in soil testing to determine metal contamination levels. Its sensitivity to metal ions makes it valuable in environmental monitoring and quality control processes.