<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31316703</termId><termName>formalin</termName><termType>PT</termType><termNote><![CDATA[ Aqueous formaldehyde solution containing 37% by weight of formaldehyde. In conservation it has been used as a fluid preserving medium, and, as an aerosol and fumigant, to treat algae on stone at sites such as the Lascaux caves. Formerly a brand name, now in common usage. ]]></termNote><termCreatedDate>2026-03-30 20:25:16</termCreatedDate><relation><relationType>BT</relationType><termId>31303873</termId><termName>formaldehyde</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31372757</termId><termName>formalin preservation</termName><termType>PT</termType></relation></term>  </Zthes>