<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31456166</termId><termName>acetylene black</termName><termType>PT</termType><termNote><![CDATA[ A form of carbon black that is produced in refractory chambers in the absence of air by the decomposition of acetylene gas preheated to 800 degrees Celsius. As a pigment, it is softer, bluer, and more intense than other carbon blacks. It is also used in industrial applications requiring high electrical conductivity, such as in dry cells. ]]></termNote><termCreatedDate>2026-03-30 21:02:47</termCreatedDate><relation><relationType>UF</relationType><termId>31456167</termId><termName>black, acetylene</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31437245</termId><termName>carbon black</termName><termType>PT</termType></relation></term>  </Zthes>