<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31410855</termId><termName>copper sulfate</termName><termType>PT</termType><termNote><![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.   ]]></termNote><termCreatedDate>2026-03-30 20:50:28</termCreatedDate><relation><relationType>UF</relationType><termId>31410856</termId><termName>copper sulphate</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31410857</termId><termName>cupric sulfate</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31410858</termId><termName>sulfate, copper</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31410859</termId><termName>vitriol of Venus</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31373704</termId><termName>sulfate</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31410874</termId><termName>copper sulfite</termName><termType>PT</termType></relation></term>  </Zthes>