<?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 dithionite</topic></authority><related type="broader"><topic>sodium compounds</topic></related><variant type="other"><topic>SDT</topic></variant><variant type="other"><topic>dithionite, sodium</topic></variant><variant type="other"><topic>hydrosulfite, sodium</topic></variant><variant type="other"><topic>sodium hydrosulfite</topic></variant><variant type="other"><topic>sodium hydrosulphite</topic></variant> <note xml:lang="en"><![CDATA[ Sodium dithionite (also known as sodium hydrosulfite) is a reductive bleaching chemical. Usage includes iron stain removal, and occasionally to treat corroded copper and silver artifacts in object conservation. It can also be used for purification of water and gas and as a sulfonating agent or a sodium ion source in industrial processes. ]]></note></mads>