<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31437255</termId><termName>Mars black</termName><termType>PT</termType><termNote><![CDATA[ Synthetically prepared black iron oxide pigment that is permanent, having a warm brownish black color, existing as a dense, heavy powder, and unlike most naturally produced black iron oxide pigments, it is magnetic. Mars black was developed in the early 20th century; it is used in oil paints, watercolors, and mortars and cements, because it does not effloresce. ]]></termNote><termCreatedDate>2026-03-30 20:57:54</termCreatedDate><relation><relationType>UF</relationType><termId>31437256</termId><termName>Mapico black</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31437257</termId><termName>black iron oxide</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31437258</termId><termName>black, Mars</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31437259</termId><termName>magnetic black iron oxide</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31411004</termId><termName>synthetic inorganic black pigment</termName><termType>PT</termType></relation></term>  </Zthes>