Difference between revisions of "Fiber optics reflectance spectroscopy (FORS)"
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| + | [[File:MFA FORS Blue spectra.jpg|thumb|FORs spectra for Dayflower and Indigo colorant commonly used on Japanese prints of the Edo period]] | ||
| + | [[File:FORS spectra for dyes on textiles.jpg|thumb|FORS spectra of natural dyes on textiles<br> from Li Ding et al. 2021 [https://www.sciencedirect.com/science/article/pii/S1296207420304842 Link]]] | ||
| + | [[File:FORS of Cochineal on wool.jpg|thumb|FORS spectra of natural red and purple dyes<br>M.A. Maynez-Rojas et al [https://www.sciencedirect.com/science/article/pii/S1386142517301075 Link]]] | ||
==Description== | ==Description== | ||
| − | + | One technique used to measure the spectral curve li light reflected from a colored surface. Fiber Optic Reflectance spectroscopy (FORS) is a non-invasive analysis technique that can identify some types of colorants. It uses a fiber optic probe and a pulsed xenon source to provide good sensitivity to examine small areas with a specific wavelength of light then measure the spectral reflectance emitted from the impinged area. The fiber optics probe minimizes the interference from ambient light. The identification of a pigment based on its reflectance is based on the comparison of standards that were prepared as closely as possible to the artist techniques. | |
For the Japanese woodblock prints of the Edo period (see Ukiyo-e Colorants), the most common blue colorants were dayflower, indigo, and later Prussian blue are easily identified by FORS as shown in the graph. This identification can be accomplished, not only in blue printed areas, but also in greens and purples, which are a combination of a blue and another colorant (yellow, red). | For the Japanese woodblock prints of the Edo period (see Ukiyo-e Colorants), the most common blue colorants were dayflower, indigo, and later Prussian blue are easily identified by FORS as shown in the graph. This identification can be accomplished, not only in blue printed areas, but also in greens and purples, which are a combination of a blue and another colorant (yellow, red). | ||
| + | |||
| + | ==Synonyms== | ||
| + | Color spectroscopy | ||
==Resources and Citations== | ==Resources and Citations== | ||
| − | * IFAC: [https://spectradb.ifac.cnr.it/fors/ | + | * IFAC: [https://spectradb.ifac.cnr.it/fors/ FORS reference spectra database] |
| + | * CHSOS: [https://chsopensource.org/pigments-checker/?mc_cid=2b8fe440b5&mc_eid=f7439a02d7 Pigment Checker Database] | ||
| + | * National Gallery of Art, Scientific Research: [https://www.nga.gov/conservation/glossary.html Glossary of Conservation Terminology] | ||
| + | * Li Ding, Tianyi Gong, Bo Wang, Qin Yang, Wei Liu, Rigzin Pemo, Tsokyi Metok, 'Non-invasive study of natural dyes in textiles of the Qing Dynasty using fiber optic reflectance spectroscopy', ''Journal of Cultural Heritage'', Vol. 47, 2021, pps 69-78. [https://www.sciencedirect.com/science/article/pii/S1296207420304842 Link] | ||
| + | * M.A. Maynez-Rojas, E. Casanova-González, J.L. Ruvalcaba-Sil, 'Identification of natural red and purple dyes on textiles by Fiber-optics Reflectance Spectroscopy', ''Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy'', Vol. 178, 2017, pps 239-250. [https://www.sciencedirect.com/science/article/pii/S1386142517301075 Link] | ||
Latest revision as of 12:32, 16 March 2024
Description
One technique used to measure the spectral curve li light reflected from a colored surface. Fiber Optic Reflectance spectroscopy (FORS) is a non-invasive analysis technique that can identify some types of colorants. It uses a fiber optic probe and a pulsed xenon source to provide good sensitivity to examine small areas with a specific wavelength of light then measure the spectral reflectance emitted from the impinged area. The fiber optics probe minimizes the interference from ambient light. The identification of a pigment based on its reflectance is based on the comparison of standards that were prepared as closely as possible to the artist techniques.
For the Japanese woodblock prints of the Edo period (see Ukiyo-e Colorants), the most common blue colorants were dayflower, indigo, and later Prussian blue are easily identified by FORS as shown in the graph. This identification can be accomplished, not only in blue printed areas, but also in greens and purples, which are a combination of a blue and another colorant (yellow, red).
Synonyms
Color spectroscopy
Resources and Citations
- IFAC: FORS reference spectra database
- CHSOS: Pigment Checker Database
- National Gallery of Art, Scientific Research: Glossary of Conservation Terminology
- Li Ding, Tianyi Gong, Bo Wang, Qin Yang, Wei Liu, Rigzin Pemo, Tsokyi Metok, 'Non-invasive study of natural dyes in textiles of the Qing Dynasty using fiber optic reflectance spectroscopy', Journal of Cultural Heritage, Vol. 47, 2021, pps 69-78. Link
- M.A. Maynez-Rojas, E. Casanova-González, J.L. Ruvalcaba-Sil, 'Identification of natural red and purple dyes on textiles by Fiber-optics Reflectance Spectroscopy', Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Vol. 178, 2017, pps 239-250. Link