<?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">iron processes</topic></authority><related type="narrower"><topic>blueprint process</topic></related><related type="narrower"><topic>kallitype</topic></related><related type="narrower"><topic>platinum process</topic></related><related type="narrower"><topic>palladium process</topic></related><related type="narrower"><topic>ferrogallic process</topic></related><related type="broader"><topic>photographic processes</topic></related><variant type="other"><topic>ferric processes</topic></variant><variant type="other"><topic>iron printing processes</topic></variant><variant type="other"><topic>iron salt processes</topic></variant><variant type="other"><topic>printing processes, iron</topic></variant><variant type="other"><topic>salt processes, iron</topic></variant> <note xml:lang="en"><![CDATA[ Photographic processes based on the photosensitivity of certain iron compounds. Usually require intense light and thus employ contact printing. Do not use when iron sulfate is used to develop a silver image. ]]></note></mads>