<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">sodium thiosulfate</topic></authority><related type="other"><topic>fixer</topic></related><related type="broader"><topic>sodium compounds</topic></related><variant type="other"><topic>hyposulfite of soda</topic></variant><variant type="other"><topic>thiosulfate, sodium</topic></variant> <note xml:lang="en"><![CDATA[ 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. ]]></note></mads>