<?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 sulfate</topic></authority><related type="other"><topic>copper sulfite</topic></related><related type="broader"><topic>sulfate</topic></related><variant type="other"><topic>copper sulphate</topic></variant><variant type="other"><topic>cupric sulfate</topic></variant><variant type="other"><topic>sulfate, copper</topic></variant><variant type="other"><topic>vitriol of Venus</topic></variant> <note xml:lang="en"><![CDATA[ A sulfate of copper, blue crystals in hydrous form, white when dehydrated. Copper sulfate is used as a preservative for wood, leather and paper; as a mordant and dye for textiles; as a biocide, and for a wide range of other purposes.   ]]></note></mads>