Used as a coagulant in water and wastewater treatment to remove impurities and suspended particles. Effective in clarifying drinking water and industrial effluents by promoting the aggregation of fine particles for easier filtration. Commonly employed in analytical chemistry as a reagent, especially in titrations involving iodine or iron content determination. Acts as an indicator in some redox reactions due to its color change properties. Applied in the textile industry for dyeing and printing processes, where it helps fix dyes to fabrics, improving color fastness and consistency. Utilized in leather tanning to stabilize collagen fibers and improve the durability and resistance of leather products. Also found in some antiseptic and astringent formulations for minor skin injuries, due to its mild antimicrobial and tissue-contracting effects.