<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31317459</termId><termName>microfadeometry</termName><termType>PT</termType><termNote><![CDATA[ Microfadeometry is a recently developed technique that measures color changes and evaluates light stability in individual objects of art that are sensitive to light exposure. A microfade tester (MFT) uses a powerful xenon arc lamp and filters to focus a beam of very intense light through a fiber optic onto a tiny spot on the surface of the artwork.  A second fiber optic collects the reflected light and delivers it to a miniature spectrometer.  As the lamp fades the surface of the artwork, the resulting color change is monitored by the spectrometer.   ]]></termNote><termCreatedDate>2026-03-30 20:25:29</termCreatedDate><relation><relationType>BT</relationType><termId>31304450</termId><termName>accelerated aging</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31398558</termId><termName>microfadeometers</termName><termType>PT</termType></relation></term>  </Zthes>