<?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">hydrofluoric acid</topic></authority><related type="broader"><topic>acid</topic></related><variant type="other"><topic>acid, hydrofluoric</topic></variant> <note xml:lang="en"><![CDATA[ A highly corrosive, caustic, and toxic water solution of hydrogen fluoride that dissolves most metals, except gold, platinum, glass, ceramics, and organic material; used for etching glass and cleaning metals. ]]></note></mads>