<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">soluble salt</topic></authority><related type="broader"><topic>salt</topic></related><variant type="other"><topic>salts, soluble</topic></variant><variant type="other"><topic>soluble salts</topic></variant><variant type="other"><topic>water-soluble salt</topic></variant><variant type="other"><topic>water-soluble salts</topic></variant> <note xml:lang="en"><![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. ]]></note></mads>