<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31301801</termId><termName>Ostwald system</termName><termType>PT</termType><termNote><![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. ]]></termNote><termCreatedDate>2026-03-30 20:21:07</termCreatedDate><relation><relationType>BT</relationType><termId>31298235</termId><termName>color systems</termName><termType>PT</termType></relation></term>  </Zthes>