Used as an indicator solution in analytical chemistry for detecting the presence of proteins in urine during clinical tests. It works by causing proteins to precipitate, leading to turbidity in the solution, which can be visually assessed or measured. Commonly applied in routine urinalysis to screen for proteinuria, a condition that may indicate kidney dysfunction or other health issues. Also utilized in qualitative analysis for metal ion detection due to its chelating properties. Its role as a derivatizing agent in chromatography enhances detection of certain compounds. Stable and reliable in field testing and laboratory settings.