Time through colors: A kinetic model of red vermilion darkening from Raman spectra
نویسندگان
چکیده
منابع مشابه
Casting light on the darkening of colors in historical paintings.
The degradation of colors in historical paintings affects our cultural heritage in both museums and archeological sites. Despite intensive experimental studies, the origin of darkening of one of the most ancient pigments known to humankind, vermilion (α-HgS), remains unexplained. Here, by combining many-body theoretical spectroscopy and high-resolution microscopic x-ray diffraction, we clarify ...
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FT-Raman Spectra of Saffron (crocus sativus L.) with a partial assignment is reported. Based on the Raman data, it is concluded that main pigments in saffron are crocins and crocetin. It is proposed that the quickly attainable FT-Raman spectrum of solid saffron, may be used as a means of saffron standardization.
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A polymethylmethacrylate (PMMA) microstructured polymer optical fiber (mPOF) is fabricated and characterized. Using the cut-back technique the fiber loss is measured which is higher than the step-index silica fibers. Through a novel experimental scheme, the backward Stokes spectrum of the fabricated mPOF is recorded over a range exceeding 3000 cm‑1 during the cut-back method and compared ...
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From these results, it was postulated that two diffusible substances are involved in the development of wild type eye color, that a cinnabar fly is deficient in one of these (cn+ substance), and that a vermilion fly is deficient in both (cn+ and v+ substances). There is evidence for the existence of a third substance necessary for the development of wild type eye color (ca. substance, so named ...
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ژورنال
عنوان ژورنال: Dyes and Pigments
سال: 2021
ISSN: 0143-7208
DOI: 10.1016/j.dyepig.2020.108866