<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31437786</termId><termName>blanc fixe</termName><termType>PT</termType><termNote><![CDATA[ A synthetic, permanent, stable white pigment prepared from precipitated barium sulfate (barite) since ca.1820s. The pure white powder is transparent when used as a filler or base for lake pigments. The reproducible whiteness of high purity led to its use in the standard white tiles for reflectance spectrophotometry.  ]]></termNote><termCreatedDate>2026-03-30 20:58:01</termCreatedDate><relation><relationType>UF</relationType><termId>31437787</termId><termName>constant white</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31437788</termId><termName>enamel white</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31437789</termId><termName>process white</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31411089</termId><termName>transparent white pigment</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31437200</termId><termName>inert pigment</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31344514</termId><termName>barite</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31437790</termId><termName>permanent white</termName><termType>PT</termType></relation></term>  </Zthes>