<?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">arsenic orange</topic></authority><related type="broader"><topic>realgar</topic></related><variant type="other"><topic>orange, arsenic</topic></variant> <note xml:lang="en"><![CDATA[ Synthetic arsenic disulfide first made in the 18th century as the counterpart to natural realgar. The synthetic variety was purer and less expensive, but is no longer used because of its toxicity. ]]></note></mads>