<?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">ambrotypes</topic></authority><related type="other"><topic>collodion</topic></related><related type="broader"><topic>direct positives</topic></related><variant type="other"><topic>ambrotype</topic></variant><variant type="other"><topic>collodion glass positives</topic></variant><variant type="other"><topic>collodion-glass positives</topic></variant><variant type="other"><topic>glass positives, collodion</topic></variant><variant type="other"><topic>glass-collodion positives</topic></variant><variant type="other"><topic>positives, collodion glass</topic></variant><variant type="other"><topic>positives, glass-collodion</topic></variant> <note xml:lang="en"><![CDATA[ Photographs produced by mounting a negative (made by a variant of the wet collodion process) that is on glass with a dark backing, which makes the image appear as a positive. Came into wide use in the United States in the early 1850s. ]]></note></mads>