<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31373662</termId><termName>sodium percarbonate</termName><termType>PT</termType><termNote><![CDATA[ A colorless, solid, water soluble carbonate perhydrate, sodium percarbonate is a highly concentrated source of anhydrous hydrogen peroxide used as a bleaching agent in many applications including paper and textile conservation. ]]></termNote><termCreatedDate>2026-03-30 20:40:46</termCreatedDate><relation><relationType>UF</relationType><termId>31373663</termId><termName>SPC</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31373664</termId><termName>percarbonate, sodium</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31343447</termId><termName>sodium compounds</termName><termType>PT</termType></relation></term>  </Zthes>