<?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">Ostwald system</topic></authority><related type="broader"><topic>color systems</topic></related> <note xml:lang="en"><![CDATA[ Additive color system devised by chemist Wilhelm Ostwald; based on 24 foundation colors arranged in a disc; each then have white and black added to form tints or shades; used predominantly in the mid-twentieth century. ]]></note></mads>