<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31301841</termId><termName>oxidative-reductive deterioration</termName><termType>PT</termType><termNote><![CDATA[ A deterioration of photographs, occurring when silver is attacked by any of a wide variety of oxidants that convert metallic silver atoms to highly reactive and mobile silver ions. It is the most common cause of fading of silver images. ]]></termNote><termCreatedDate>2026-03-30 20:21:08</termCreatedDate><relation><relationType>UF</relationType><termId>31301842</termId><termName>deterioration, oxidative-reductive</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31298256</termId><termName>conditions and effects for photography</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31326339</termId><termName>photographs</termName><termType>PT</termType></relation></term>  </Zthes>