<?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">opacifiers</topic></authority><related type="broader"><topic>materials by function</topic></related><variant type="other"><topic>opacifier</topic></variant> <note xml:lang="en"><![CDATA[ Any materials added to increase optical density and make opaque. In ceramics, opacifiers are substances added to glaze or enamels for this purpose. They include tin oxide, titanium dioxide, and lead chromate. ]]></note></mads>