Used as a reducing agent and accelerator in photographic developing processes, particularly in black-and-white developers, where it helps produce high-contrast images.

Commonly employed in electroplating baths to improve the brightness and smoothness of metal coatings, especially in silver, tin, nickel, and copper plating.

Acts as a stabilizer and curing agent in polymer and resin formulations, enhancing heat resistance and mechanical strength.

Utilized in analytical chemistry for the detection and separation of metal ions such as mercury, copper, and bismuth due to its complexing ability, including precipitation of heavy metals and analysis in water or soil samples.

Applied in the textile industry to improve dye fixation and color fastness on fabrics, particularly cotton.

Widely used in the extraction of gold and silver from ores or recycled materials as a lixiviant for precious metals.

Also serves as an intermediate in the synthesis of pharmaceuticals, agrochemicals (including fungicides), and rubber additives.