Ammonium thiosulfate is a white crystalline solid inorganic compound with the chemical formula H8N2O3S2, and CAS 7783-18-8. The slightly toxic compound is used in photography, leaching of gold and silver, and as a fertilizer.
Ammonium thiosulfate is a slightly toxic, inorganic, white, inorganic compound. Exposure can cause skin and eye irritation. Extended exposure may irritate the respiratory system.
Ammonium thiosulfate is non-flammable with an ammonia odor, is readily soluble in water, slightly soluble in acetone and insoluble in ethanol and diethyl ether.
The crystalline compound is used in photography for the development of film as a rapid photographic fixer that acts more quickly than sodium thiosulfate fixers. It is also used in the presence of copper as a catalyst in the leaching of gold and silver. When mixed with water ammonium thiosulfate can be used as a fertilizer and as an additive to coal-waste mixtures to reduce formation of dangerous dioxins and furans.
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