<?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">copper oxalate</topic></authority><related type="broader"><topic>corrosion</topic></related><variant type="other"><topic>oxalate, copper</topic></variant> <note xml:lang="en"><![CDATA[ A rare light blue corrosion product found as a contributing factor to the greenish chromatic degradation of azurite in mural paintings, and in the patina of outdoor bronze monuments such as the horses of San Marco in Venice. ]]></note></mads>