<?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">verdigris</topic></authority><related type="other"><topic>verdigris</topic></related><related type="broader"><topic>patina</topic></related><variant type="other"><topic>aeruca</topic></variant><variant type="other"><topic>aerugo</topic></variant> <note xml:lang="en"><![CDATA[ Term used in a general sense to refer to various types of copper corrosion. Even though "verdigris" technically chemically refers only to basic copper acetate, the term is also used for natural green patinas composed of copper sulfate, copper chloride, or basic copper carbonate. ]]></note></mads>