<?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">thiourea</topic></authority><related type="broader"><topic>compounds</topic></related><variant type="other"><topic>thiocarbamide</topic></variant><variant type="other"><topic>thiurea</topic></variant><variant type="other"><topic>sulfocarbamide</topic></variant><variant type="other"><topic>sulfourea</topic></variant> <note xml:lang="en"><![CDATA[ Shiny white crystalline compound used in photography as a toner and to remove stains from negatives. Capable of dissolving silver salts, thiourea is often an active ingredient in silver-dip tarnish removal solutions. It is also used to accelerate the vulcanization of rubber. Its composition is the same as that of urea but with a sulfur atom in place of the oxygen atom. ]]></note></mads>