Abstract

Lightfastness tests of cultural objects are performed with so-called microfading test systems. The system allows measurements through glass. Case studies showed that tests through glazing are feasible, but some theoretical and practical aspects are not clarified. In this paper, the influence of the glazing on the measurement is analyzed theoretically and experimentally. Deviations in the precision of color measurements through glass are analyzed. Furthermore, the lightfastness of samples is tested through glass and compared to tests without glass. Results indicate that lightfastness tests through glass are an awkward task, especially if tests with and without glass are compared. Recommendations for the execution and evaluation of tests through glass are given.

摘要

文物的耐光性测试使用所谓的微褪色测试系统进行。该系统允许通过玻璃进行测量。案例研究表明，通过玻璃进行测试是可行的，但一些理论和实践方面没有得到澄清。本文从理论上和实验上分析了玻璃对测量的影响。分析了通过玻璃测量颜色精度的偏差。此外，样品的耐光性通过玻璃进行测试，并与没有玻璃的测试进行比较。结果表明，通过玻璃进行耐光性测试是一项艰巨的任务，尤其是在比较有玻璃和无玻璃的测试时。给出了通过玻璃执行和评估测试的建议。