<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31437804</termId><termName>bismuth oxide</termName><termType>PT</termType><termNote><![CDATA[ A manufactured compound of bismuth that occurs naturally as the mineral bismite. It is a heavy yellow powder, insoluble in water and soluble in acids, used as a pigment for enamels and ceramics. Also used in reflectance/transmittance testing as a colorant that permits "tagging" of a fill or coating in order to evaluate its effectiveness. ]]></termNote><termCreatedDate>2026-03-30 20:58:01</termCreatedDate><relation><relationType>UF</relationType><termId>31437805</termId><termName>bismuth trioxide</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31437806</termId><termName>bismuth yellow</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31437807</termId><termName>oxide, bismuth</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31437808</termId><termName>trioxide, bismuth</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31411093</termId><termName>inorganic yellow pigment</termName><termType>PT</termType></relation></term>  </Zthes>