<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31344819</termId><termName>soluble salt</termName><termType>PT</termType><termNote><![CDATA[ Soluble salts are dissolved minerals whose crystallization on the surface and in the substrate of materials causes efflorescence and deterioration.The presence of water-soluble salts is a key factor in the degradation of masonry and other highly porous stone building materials. Surface efflorescence is a serious threat to ancient mural paintings. Conservation seeks to identify soluble salts in objects affected, and extract them or otherwise halt the degradation they inflict. ]]></termNote><termCreatedDate>2026-03-30 20:33:00</termCreatedDate><relation><relationType>UF</relationType><termId>31344822</termId><termName>water-soluble salt</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31344823</termId><termName>water-soluble salts</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31344820</termId><termName>salts, soluble</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31344821</termId><termName>soluble salts</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31320494</termId><termName>salt</termName><termType>PT</termType></relation></term>  </Zthes>