Primarily used in analytical chemistry as a reagent for detecting the presence of iron ions, it forms a blood-red complex with ferric ions, aiding in qualitative analysis. In the textile industry, it serves as a key component in dyeing and printing processes, helping to stabilize certain dyes and improve color fastness. Additionally, it is employed in the synthesis of pharmaceuticals and organic compounds, acting as a versatile intermediate in various chemical reactions. In agriculture, it is sometimes utilized as a pesticide or herbicide, offering effective control over certain plant pathogens. Its role in photography includes use as a toner to enhance image quality and stability. Furthermore, it finds application in metal treatment processes, such as metal cleaning and electroplating, due to its ability to form stable complexes with metal ions.