Analyzing the Color on Ivory: Scientific Research on a Chinese Panel of the Eighteenth Century in Studies in conservation, Vol.67 N°7-8(2022; October-November) (2022-10-01)  

Public ISBD [article]  inStudies in conservation > Vol.67 N°7-8(2022; October-November) (2022-10-01) . - P. 423-429 Titre : Analyzing the Color on Ivory: Scientific Research on a Chinese Panel of the Eighteenth Century Type de document : texte imprimé Année de publication : 2022 Article en page(s) : P. 423-429 Langues : Anglais (eng) Catégories : Carmin -- 18e siècle -- Conservation et restauration Couleurs -- Chine --18e siècle -- Analyse Peinture sur ivoire -- Chine -- 18e siècle -- Conservation et restauration Raman, Effet augmenté en surface Spectroscopie Raman Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Ivory handicraft developed in China 7000 years ago and reached its peak during the Qing dynasty. Among the numerous court collections of ivory handicrafts, a hanging polychrome panel describing a scene of prosperous business at the harbor near Guangzhou with an exquisite embedded ivory carving was analyzed comprehensively for pigments and dyes. A process for painting on ivory was revealed with the help of scientific analysis. In this artifact, the palette included reds made of hematite, cinnabar, and cochineal, blues based on azurite and Prussian blue, and greens made with mixtures of gamboge and Prussian blue. For the first time, surface-enhanced Raman spectroscopy (SERS) was used for analyzing the dyes used on ivory. Besides analyzing the pigments and dyes in painted ivory technology, the dating of the painted artifact was estimated on the basis of pigment manufacturing and trading history. It was concluded that the artifact belonged to the Qianlong Emperor of the Qing dynasty. En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1913386 [article] Analyzing the Color on Ivory: Scientific Research on a Chinese Panel of the Eighteenth Century [texte imprimé] . - 2022 . - P. 423-429. Langues : Anglais (eng) in Studies in conservation > Vol.67 N°7-8(2022; October-November) (2022-10-01) . - P. 423-429 Catégories : Carmin -- 18e siècle -- Conservation et restauration Couleurs -- Chine --18e siècle -- Analyse Peinture sur ivoire -- Chine -- 18e siècle -- Conservation et restauration Raman, Effet augmenté en surface Spectroscopie Raman Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Ivory handicraft developed in China 7000 years ago and reached its peak during the Qing dynasty. Among the numerous court collections of ivory handicrafts, a hanging polychrome panel describing a scene of prosperous business at the harbor near Guangzhou with an exquisite embedded ivory carving was analyzed comprehensively for pigments and dyes. A process for painting on ivory was revealed with the help of scientific analysis. In this artifact, the palette included reds made of hematite, cinnabar, and cochineal, blues based on azurite and Prussian blue, and greens made with mixtures of gamboge and Prussian blue. For the first time, surface-enhanced Raman spectroscopy (SERS) was used for analyzing the dyes used on ivory. Besides analyzing the pigments and dyes in painted ivory technology, the dating of the painted artifact was estimated on the basis of pigment manufacturing and trading history. It was concluded that the artifact belonged to the Qianlong Emperor of the Qing dynasty. En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1913386

Revealing the Fugitive Palette of the Early American South: A SERS Study of Eighteenth-century Oil Paintings in Studies in conservation, Vol.67 N°7-8(2022; October-November) (2022-10-01)

Public ISBD [article]  inStudies in conservation > Vol.67 N°7-8(2022; October-November) (2022-10-01) . - P. 556-568 Titre : Revealing the Fugitive Palette of the Early American South: A SERS Study of Eighteenth-century Oil Paintings Type de document : texte imprimé Année de publication : 2022 Article en page(s) : P. 556-568 Langues : Anglais (eng) Catégories : Couleur -- Altération Peinture à l'huile -- 18e siècle -- Analyse Peintures -- 18e siècle -- Colonies britanniques -- Amérique Pigments minéraux -- Déterioration Raman, Effet augmenté en surface Spectroscopie Raman Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : The identification of organic colorants in traditional oil paintings is an important and challenging area of conservation research. Since many organic dyes and pigments are fugitive, the detection of these materials is crucial for the proper assessment of fading, conservation treatment, and the prevention of further photodamage. While numerous methods exist to characterize colorants, recent advances in surface-enhanced Raman scattering (SERS) methodologies have enabled the unambiguous identification of various organic dyestuffs in oil paintings in a minimally invasive manner. Here, we apply a collection of SERS-based protocols to identify the organic pigments used in a number of oil paintings that were made in the Southern British colonies of North America during the eighteenth century and are being prepared for exhibition at the Art Museums of Colonial Williamsburg. Questions arose during the painting examinations that would appear to involve color shifts and possible fading. The SERS results reveal the identity of several organic pigments (i.e. carmine lake, madder lake, Reseda lake, indigo, gamboge) in these eighteenth-century portraits, within the broad-scale quantity-rich areas of the composition as well as the more challenging flesh tones and small, yet important, detail regions. We discover the continued use of carmine lake in seven of the ten paintings and identify the blue and yellow organic pigments used in this group, both of which contribute to our understanding of pigment availability and artists’ choices, as well as supporting the more accurate assessment of condition and the artists’ original intent. [article] Revealing the Fugitive Palette of the Early American South: A SERS Study of Eighteenth-century Oil Paintings [texte imprimé] . - 2022 . - P. 556-568. Langues : Anglais (eng) in Studies in conservation > Vol.67 N°7-8(2022; October-November) (2022-10-01) . - P. 556-568 Catégories : Couleur -- Altération Peinture à l'huile -- 18e siècle -- Analyse Peintures -- 18e siècle -- Colonies britanniques -- Amérique Pigments minéraux -- Déterioration Raman, Effet augmenté en surface Spectroscopie Raman Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : The identification of organic colorants in traditional oil paintings is an important and challenging area of conservation research. Since many organic dyes and pigments are fugitive, the detection of these materials is crucial for the proper assessment of fading, conservation treatment, and the prevention of further photodamage. While numerous methods exist to characterize colorants, recent advances in surface-enhanced Raman scattering (SERS) methodologies have enabled the unambiguous identification of various organic dyestuffs in oil paintings in a minimally invasive manner. Here, we apply a collection of SERS-based protocols to identify the organic pigments used in a number of oil paintings that were made in the Southern British colonies of North America during the eighteenth century and are being prepared for exhibition at the Art Museums of Colonial Williamsburg. Questions arose during the painting examinations that would appear to involve color shifts and possible fading. The SERS results reveal the identity of several organic pigments (i.e. carmine lake, madder lake, Reseda lake, indigo, gamboge) in these eighteenth-century portraits, within the broad-scale quantity-rich areas of the composition as well as the more challenging flesh tones and small, yet important, detail regions. We discover the continued use of carmine lake in seven of the ten paintings and identify the blue and yellow organic pigments used in this group, both of which contribute to our understanding of pigment availability and artists’ choices, as well as supporting the more accurate assessment of condition and the artists’ original intent.

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