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Sodium thiosulfate (Na2S2O3) is a chemical compound that is commonly used in various applications. It is a white crystalline solid that is soluble in water and has a slight odor of sulfur.

One of the main uses of sodium thiosulfate is as a photographic fixing agent. It is used to remove the unexposed silver halide from photographic film or paper after development, making the image permanent. Sodium thiosulfate acts by converting the silver halide into a soluble complex, which can be washed away.

In addition to photography, sodium thiosulfate is also used in other industrial processes. It is used in the treatment of wastewater and in the extraction of gold and silver from ores. It is also used as a reducing agent in certain chemical reactions and as an antichlor agent to neutralize chlorine in swimming pools and water treatment plants.

Sodium thiosulfate has several medical uses as well. It is used as an antidote for cyanide poisoning, as it reacts with cyanide to form a non-toxic compound. It is also used in the treatment of calciphylaxis, a rare and painful condition that causes skin necrosis.

While sodium thiosulfate is generally considered safe, prolonged exposure or ingestion can cause irritation to the skin, eyes, and respiratory system. It is important to handle and store sodium thiosulfate properly, following all safety precautions and guidelines.