. "A chemical compound with the property of making silver salts water-soluble. This property was discovered by Sir John Herschel in 1819, who recommended it as a fixer in photographic processing. It is also used in conservation practice as a cleaning agent for silver and silver-gilt surfaces, and removing silver chloride from wet-washed paper and wet-washed textiles."@en . . "2014-01-22T10:31:45"^^ . "2014-02-28T17:43:20"^^ . "sodium thiosulfate"@en . "300389874" . . "hyposulfite of soda"@en . "thiosulfate, sodium"@en .