Seeing red: towards an improved protocol for the identification of madder- and cochineal-based pigments by fiber optics reflectance spectroscopy (FORS)
Abstract Fiber optics reflectance spectroscopy (FORS) is commonly used to non-invasively identify madder- and cochineal-based pigments on works of art, but the significant shifts sometimes observed in the position of their diagnostic absorption features can hinder correct interpretation of the spect...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-11-01
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| Series: | Heritage Science |
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| Online Access: | http://link.springer.com/article/10.1186/s40494-019-0335-1 |
| _version_ | 1818301156469768192 |
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| author | Beatriz Fonseca Catherine Schmidt Patterson Monica Ganio Douglas MacLennan Karen Trentelman |
| author_facet | Beatriz Fonseca Catherine Schmidt Patterson Monica Ganio Douglas MacLennan Karen Trentelman |
| author_sort | Beatriz Fonseca |
| collection | DOAJ |
| description | Abstract Fiber optics reflectance spectroscopy (FORS) is commonly used to non-invasively identify madder- and cochineal-based pigments on works of art, but the significant shifts sometimes observed in the position of their diagnostic absorption features can hinder correct interpretation of the spectra. To better understand these shifts, and improve the ability to confidently identify these pigments, a systematic study was carried out to evaluate the effects of different pigment recipes and laking substrates on reflectance spectra. Sixteen different madder- and cochineal-based pigments were synthesized using historical recipes. Each pigment, painted in four different binding media (gum Arabic, linseed oil, beeswax, and egg yolk), was fully characterized by FTIR and HPLC-DAD-MS prior to FORS measurements. The results of the study showed that, in contrast to the absorption features typically used for identification, features in the first derivative transformation of the FORS spectra provided a more robust means of primary identification. In addition, once it has been identified as cochineal, the absorption features in the spectra of cochineal-based pigments could be correlated to the recipe employed, providing a possible means for inferring the method of manufacture and laking substrate from a non-invasive analysis. The results of this study were used to create a decision tree for the identification of madder and cochineal pigments based solely on FORS. |
| first_indexed | 2024-12-13T05:18:32Z |
| format | Article |
| id | doaj.art-a5bb085a6bda41f9aa1481cfd656ab80 |
| institution | Directory Open Access Journal |
| issn | 2050-7445 |
| language | English |
| last_indexed | 2024-12-13T05:18:32Z |
| publishDate | 2019-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Heritage Science |
| spelling | doaj.art-a5bb085a6bda41f9aa1481cfd656ab802022-12-21T23:58:23ZengSpringerOpenHeritage Science2050-74452019-11-017111510.1186/s40494-019-0335-1Seeing red: towards an improved protocol for the identification of madder- and cochineal-based pigments by fiber optics reflectance spectroscopy (FORS)Beatriz Fonseca0Catherine Schmidt Patterson1Monica Ganio2Douglas MacLennan3Karen Trentelman4Getty Conservation InstituteGetty Conservation InstituteGetty Conservation InstituteGetty Conservation InstituteGetty Conservation InstituteAbstract Fiber optics reflectance spectroscopy (FORS) is commonly used to non-invasively identify madder- and cochineal-based pigments on works of art, but the significant shifts sometimes observed in the position of their diagnostic absorption features can hinder correct interpretation of the spectra. To better understand these shifts, and improve the ability to confidently identify these pigments, a systematic study was carried out to evaluate the effects of different pigment recipes and laking substrates on reflectance spectra. Sixteen different madder- and cochineal-based pigments were synthesized using historical recipes. Each pigment, painted in four different binding media (gum Arabic, linseed oil, beeswax, and egg yolk), was fully characterized by FTIR and HPLC-DAD-MS prior to FORS measurements. The results of the study showed that, in contrast to the absorption features typically used for identification, features in the first derivative transformation of the FORS spectra provided a more robust means of primary identification. In addition, once it has been identified as cochineal, the absorption features in the spectra of cochineal-based pigments could be correlated to the recipe employed, providing a possible means for inferring the method of manufacture and laking substrate from a non-invasive analysis. The results of this study were used to create a decision tree for the identification of madder and cochineal pigments based solely on FORS.http://link.springer.com/article/10.1186/s40494-019-0335-1CochinealMadderReflectance spectroscopyFORSAbsorptionLake pigments |
| spellingShingle | Beatriz Fonseca Catherine Schmidt Patterson Monica Ganio Douglas MacLennan Karen Trentelman Seeing red: towards an improved protocol for the identification of madder- and cochineal-based pigments by fiber optics reflectance spectroscopy (FORS) Heritage Science Cochineal Madder Reflectance spectroscopy FORS Absorption Lake pigments |
| title | Seeing red: towards an improved protocol for the identification of madder- and cochineal-based pigments by fiber optics reflectance spectroscopy (FORS) |
| title_full | Seeing red: towards an improved protocol for the identification of madder- and cochineal-based pigments by fiber optics reflectance spectroscopy (FORS) |
| title_fullStr | Seeing red: towards an improved protocol for the identification of madder- and cochineal-based pigments by fiber optics reflectance spectroscopy (FORS) |
| title_full_unstemmed | Seeing red: towards an improved protocol for the identification of madder- and cochineal-based pigments by fiber optics reflectance spectroscopy (FORS) |
| title_short | Seeing red: towards an improved protocol for the identification of madder- and cochineal-based pigments by fiber optics reflectance spectroscopy (FORS) |
| title_sort | seeing red towards an improved protocol for the identification of madder and cochineal based pigments by fiber optics reflectance spectroscopy fors |
| topic | Cochineal Madder Reflectance spectroscopy FORS Absorption Lake pigments |
| url | http://link.springer.com/article/10.1186/s40494-019-0335-1 |
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