<?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">ferric chloride</topic></authority><related type="broader"><topic>salt</topic></related><variant type="other"><topic>perchloride, iron</topic></variant><variant type="other"><topic>chloride, ferric</topic></variant><variant type="other"><topic>chloride, iron</topic></variant><variant type="other"><topic>iron chloride</topic></variant><variant type="other"><topic>iron perchloride</topic></variant><variant type="other"><topic>iron, perchloride of</topic></variant><variant type="other"><topic>perchloride of iron</topic></variant> <note xml:lang="en"><![CDATA[ Material used as an ingredient of mordants in the production of etchings rather than nitric acid due to its ability to produce more selectively vertical lines. ]]></note></mads>