Used as a reagent in analytical chemistry for the detection and determination of formaldehyde, it forms a colored complex that can be measured spectrophotometrically. It is also employed in the analysis of nitrites, nitrates, and sulfites, where it acts as a chromogenic agent. In environmental testing, it helps in monitoring air quality by detecting formaldehyde emissions and other pollutants. Additionally, it serves as a dye intermediate in the textile industry for producing specific colorants. Its stability and reactivity make it valuable in various laboratory applications for qualitative and quantitative analysis.