<?xml version="1.0" encoding="utf-8"?><metadata xmlns:dc="http://purl.org/dc/elements/1.1/"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dcterms="http://purl.org/dc/terms/"><dc:title xml:lang="en">sodium thiosulfate</dc:title><dc:identifier>http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31373687</dc:identifier><dc:language>en</dc:language><dc:publisher xml:lang="en">Getty Institute</dc:publisher><dcterms:created>2026-03-30 20:40:46</dcterms:created><dcterms:isPartOf xsi:type="dcterms:URI">http://AATesaurus.cultura.gencat.cat/aat/getty_en</dcterms:isPartOf><dcterms:isPartOf xml:lang="en">Tesaurus d&apos;Art i Arquitectura</dcterms:isPartOf><dc:format>text/html</dc:format> <dcterms:alternative xml:lang="en">hyposulfite of soda</dcterms:alternative> <dcterms:alternative xml:lang="en">thiosulfate, sodium</dcterms:alternative> <dc:description 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. ]]></dc:description></metadata>