An Investigation of Discoloured Oil-bound Copper Green Glazes in a Seventeenth-century Harpsichord Lid, With Reference to Reconstructions 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. 584-602 Titre : An Investigation of Discoloured Oil-bound Copper Green Glazes in a Seventeenth-century Harpsichord Lid, With Reference to Reconstructions Type de document : texte imprimé Année de publication : 2022 Article en page(s) : P. 584-602 Langues : Anglais (eng) Catégories : Acétates Chlorure cuivreux Glaçures -- 17e siècle -- Conservation et restauration Glaçures -- 17e siècle -- Déterioration Huile de lin Microscopie Oxydation Oxydes de cuivre -- Dans l'art -- 17e siècle Radiocristallographie Spectroscopie des rayons X Index. décimale : 7.025 Dommages. Conservation. Protection En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1954440 [article] An Investigation of Discoloured Oil-bound Copper Green Glazes in a Seventeenth-century Harpsichord Lid, With Reference to Reconstructions [texte imprimé] . - 2022 . - P. 584-602. Langues : Anglais (eng) in Studies in conservation > Vol.67 N°7-8(2022; October-November) (2022-10-01) . - P. 584-602 Catégories : Acétates Chlorure cuivreux Glaçures -- 17e siècle -- Conservation et restauration Glaçures -- 17e siècle -- Déterioration Huile de lin Microscopie Oxydation Oxydes de cuivre -- Dans l'art -- 17e siècle Radiocristallographie Spectroscopie des rayons X Index. décimale : 7.025 Dommages. Conservation. Protection En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1954440

A Significant Japanese Coffer: A Multi-disciplinary Approach to Examining Late Sixteenth- — Early Seventeenth-Century Export Urushi Ware 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. 487-499 Titre : A Significant Japanese Coffer: A Multi-disciplinary Approach to Examining Late Sixteenth- — Early Seventeenth-Century Export Urushi Ware Type de document : texte imprimé Année de publication : 2022 Article en page(s) : P. 487-499 Langues : Anglais (eng) Catégories : Bois -- Japon -- 17e siècle -- Identification Coffres -- Japon -- 17e siècle -- Conservation et restauration Coffres -- Japon -- 17e siècle -- Datation -- Documentation Datation -- Méthode du carbone 14 Interdisciplinarité dans les sciences Laques (arts décoratifs) -- Japon -- 17e siècle -- Conservation et restauration Microscopie Spectroscopie de réflectance Spectroscopie des rayons X Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : A significant coffer in the Royal Swedish collection, inventory number HGK 406, is examined. The aim is to confirm or add new data concerning its age, provenance, and components of manufacture. The scientific analyses include microscopy of cross and thin sections, wood species identification, scanning electron microscopy with energy-dispersive X-ray spectroscopy, X−ray fluorescence microscopy, pyrolysis-gas chromatography-mass spectrometry, strontium isotope ratio measurement, and radiocarbon dating. To a lesser degree, the investigation also includes excerpting and examining historical documents. The results show that the body wood is Thujopsis dolabrata BUN 1248, a strong indication for a Japanese origin of the coffer. The urushi coating is made with sap harvested in Japan from the species Toxicodendron vernicifluum. The decorations include gold powder, red iron oxide, and cinnabar pigments. Radiocarbon dating supports dating of the coffer, also based on its style, as late sixteenth or early seventeenth century. While all the results may not stand alone, the study shows that a methodology with a multidisciplinary approach can produce new knowledge, as well as support or reject hypotheses arrived at from other kinds of sources. En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1902142 [article] A Significant Japanese Coffer: A Multi-disciplinary Approach to Examining Late Sixteenth- — Early Seventeenth-Century Export Urushi Ware [texte imprimé] . - 2022 . - P. 487-499. Langues : Anglais (eng) in Studies in conservation > Vol.67 N°7-8(2022; October-November) (2022-10-01) . - P. 487-499 Catégories : Bois -- Japon -- 17e siècle -- Identification Coffres -- Japon -- 17e siècle -- Conservation et restauration Coffres -- Japon -- 17e siècle -- Datation -- Documentation Datation -- Méthode du carbone 14 Interdisciplinarité dans les sciences Laques (arts décoratifs) -- Japon -- 17e siècle -- Conservation et restauration Microscopie Spectroscopie de réflectance Spectroscopie des rayons X Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : A significant coffer in the Royal Swedish collection, inventory number HGK 406, is examined. The aim is to confirm or add new data concerning its age, provenance, and components of manufacture. The scientific analyses include microscopy of cross and thin sections, wood species identification, scanning electron microscopy with energy-dispersive X-ray spectroscopy, X−ray fluorescence microscopy, pyrolysis-gas chromatography-mass spectrometry, strontium isotope ratio measurement, and radiocarbon dating. To a lesser degree, the investigation also includes excerpting and examining historical documents. The results show that the body wood is Thujopsis dolabrata BUN 1248, a strong indication for a Japanese origin of the coffer. The urushi coating is made with sap harvested in Japan from the species Toxicodendron vernicifluum. The decorations include gold powder, red iron oxide, and cinnabar pigments. Radiocarbon dating supports dating of the coffer, also based on its style, as late sixteenth or early seventeenth century. While all the results may not stand alone, the study shows that a methodology with a multidisciplinary approach can produce new knowledge, as well as support or reject hypotheses arrived at from other kinds of sources. En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1902142

Technical Study of Ethiopian Copper Alloy Processional Crosses Using Non-Destructive Analysis 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. 459-471 Titre : Technical Study of Ethiopian Copper Alloy Processional Crosses Using Non-Destructive Analysis Type de document : texte imprimé Année de publication : 2022 Article en page(s) : P. 459-471 Langues : Anglais (eng) Catégories : Arts du métal -- Éthiopie -- Conservation et restauration Croix -- Éthiopie -- Conservation et restauration Cuivre -- Alliages -- Éthiopie -- Conservation et restauration Métaux -- Identification Procédés de fabrication Spectroscopie de fluorescence Spectroscopie des rayons X Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : The materials and techniques used to make Ethiopian copper and copper alloy processional crosses from the twelfth to twentieth centuries were investigated through technical study including X-ray fluorescence analysis (XRF). All 20 crosses in this multi-collection study underwent XRF analysis while the eight crosses from the collection of the Virginia Museum of Fine Arts additionally underwent X-radiography and scanning micro-XRF. The documentation of fabrication methods and repairs was carried out using non-destructive methods, including the application of scanning micro-XRF, which in this study, proved to be especially valuable for identifying and mapping solder and cast-on repairs. Additionally, results from XRF analysis confirmed patterns in alloy type related to cross style and chronology. Specifically, bronze was identified as the alloy used to make the earliest (twelfth – fourteenth century) crosses, while the later crosses (post fifteenth century) were found to be made of brass and gunmetal. Crosses dating to what appears to be a transitional period during the fourteenth – fifteenth century were found to be made of a greater variety of materials including copper, bronze, and brass. While the difference in alloy types found in crosses from different time periods may be related to changing preferences or access to certain metals, the mass removal of religious art in the sixteenth century could have also impacted the types of crosses that remain. En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1910440 [article] Technical Study of Ethiopian Copper Alloy Processional Crosses Using Non-Destructive Analysis [texte imprimé] . - 2022 . - P. 459-471. Langues : Anglais (eng) in Studies in conservation > Vol.67 N°7-8(2022; October-November) (2022-10-01) . - P. 459-471 Catégories : Arts du métal -- Éthiopie -- Conservation et restauration Croix -- Éthiopie -- Conservation et restauration Cuivre -- Alliages -- Éthiopie -- Conservation et restauration Métaux -- Identification Procédés de fabrication Spectroscopie de fluorescence Spectroscopie des rayons X Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : The materials and techniques used to make Ethiopian copper and copper alloy processional crosses from the twelfth to twentieth centuries were investigated through technical study including X-ray fluorescence analysis (XRF). All 20 crosses in this multi-collection study underwent XRF analysis while the eight crosses from the collection of the Virginia Museum of Fine Arts additionally underwent X-radiography and scanning micro-XRF. The documentation of fabrication methods and repairs was carried out using non-destructive methods, including the application of scanning micro-XRF, which in this study, proved to be especially valuable for identifying and mapping solder and cast-on repairs. Additionally, results from XRF analysis confirmed patterns in alloy type related to cross style and chronology. Specifically, bronze was identified as the alloy used to make the earliest (twelfth – fourteenth century) crosses, while the later crosses (post fifteenth century) were found to be made of brass and gunmetal. Crosses dating to what appears to be a transitional period during the fourteenth – fifteenth century were found to be made of a greater variety of materials including copper, bronze, and brass. While the difference in alloy types found in crosses from different time periods may be related to changing preferences or access to certain metals, the mass removal of religious art in the sixteenth century could have also impacted the types of crosses that remain. En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1910440

The Technical Analysis and Conservation of John La Farge’s Newport Congregational Church Mural Decorations (1880) in Newport, Rhode Island in Studies in conservation, Vol.68 N°1-2(2023; January-February) (2023-01-01)

Public ISBD [article]  inStudies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 193-209 Titre : The Technical Analysis and Conservation of John La Farge’s Newport Congregational Church Mural Decorations (1880) in Newport, Rhode Island Type de document : texte imprimé Année de publication : 2023 Article en page(s) : P. 193-209 Langues : Anglais (eng) Catégories : Chromatographie en phase gazeuse Cire d'abeille -- Dans l'art -- 19e siècle -- Analyse Décoration intérieure -- Matériaux -- 19e siècle -- Analyse Décoration intérieure -- Matériaux -- 19e siècle -- Formules et recettes Détrempe (peinture) -- Analyse Église -- Newport (R.I., États-Unis) -- 19e siècle -- Conservation et restauration Fourier, Spectroscopie infrarouge à transformée de La Farge, John (1835-1910) Microscopie électronique à balayage Peinture et décoration murales -- Newport (R.I., États-Unis) -- 19e siècle -- Conservation et restauration Pigments -- 19e siècle -- Analyse Résines fossiles -- Dans l'art -- 19e siècle -- Analyse Spectrométrie de masse Spectroscopie des rayons X Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : John La Farge (1835–1910) is regarded as an innovator of American interior decoration. His materials and techniques successfully created unique and eye-catching effects across the interior surfaces of monumental buildings. The recent conservation treatment of the Newport Congregational Church in Newport, Rhode Island afforded the opportunity to perform the first comprehensive analysis of one such painted interior. Materials analyses of the media and pigments were carried out using Fourier transform infrared spectroscopy (FTIR), gas chromatography-mass spectrometry (GC-MS), and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX). In addition, reconstructions of La Farge’s medium were prepared based on a number of available archival paint recipes in order to further inform the analysis and to help develop a better understanding of the materials La Farge likely used for specific passages and colors. The results of the project suggest that La Farge primarily achieved his varied surfaces with two mediums: distemper-bound passages juxtaposed with areas bound in a mixture of beeswax and larch balsam diluted with solvents. Analysis, archival research, and reconstructions were ultimately used to illustrate the vulnerabilities of La Farge’s surfaces but also to reveal the artist’s original intent and technique. [article] The Technical Analysis and Conservation of John La Farge’s Newport Congregational Church Mural Decorations (1880) in Newport, Rhode Island [texte imprimé] . - 2023 . - P. 193-209. Langues : Anglais (eng) in Studies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 193-209 Catégories : Chromatographie en phase gazeuse Cire d'abeille -- Dans l'art -- 19e siècle -- Analyse Décoration intérieure -- Matériaux -- 19e siècle -- Analyse Décoration intérieure -- Matériaux -- 19e siècle -- Formules et recettes Détrempe (peinture) -- Analyse Église -- Newport (R.I., États-Unis) -- 19e siècle -- Conservation et restauration Fourier, Spectroscopie infrarouge à transformée de La Farge, John (1835-1910) Microscopie électronique à balayage Peinture et décoration murales -- Newport (R.I., États-Unis) -- 19e siècle -- Conservation et restauration Pigments -- 19e siècle -- Analyse Résines fossiles -- Dans l'art -- 19e siècle -- Analyse Spectrométrie de masse Spectroscopie des rayons X Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : John La Farge (1835–1910) is regarded as an innovator of American interior decoration. His materials and techniques successfully created unique and eye-catching effects across the interior surfaces of monumental buildings. The recent conservation treatment of the Newport Congregational Church in Newport, Rhode Island afforded the opportunity to perform the first comprehensive analysis of one such painted interior. Materials analyses of the media and pigments were carried out using Fourier transform infrared spectroscopy (FTIR), gas chromatography-mass spectrometry (GC-MS), and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX). In addition, reconstructions of La Farge’s medium were prepared based on a number of available archival paint recipes in order to further inform the analysis and to help develop a better understanding of the materials La Farge likely used for specific passages and colors. The results of the project suggest that La Farge primarily achieved his varied surfaces with two mediums: distemper-bound passages juxtaposed with areas bound in a mixture of beeswax and larch balsam diluted with solvents. Analysis, archival research, and reconstructions were ultimately used to illustrate the vulnerabilities of La Farge’s surfaces but also to reveal the artist’s original intent and technique.

Treating Smalt : A Preliminary SEM-EDX Study of the Effects of Aqueous-based Alkaline Conservation Treatments on Smalt in Wall Paintings in Studies in conservation, Vol.68 N°1-2(2023; January-February) (2023-01-01)

Public ISBD [article]  inStudies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 68-83 Titre : Treating Smalt : A Preliminary SEM-EDX Study of the Effects of Aqueous-based Alkaline Conservation Treatments on Smalt in Wall Paintings Type de document : texte imprimé Année de publication : 2023 Article en page(s) : P. 68-83 Langues : Anglais (eng) Catégories : Baryum -- Composés Lixiviation Microscopie électronique à balayage Peinture et décoration murales de la Renaissance -- Conservation et restauration pH -- Mesure Pigments -- Conservation et restauration -- Effets de l'eau Pigments -- Déterioration -- Méthode comparative Sels d'ammonium Solutions aqueuses (chimie) Spectroscopie des rayons X Mots-clés : Smalt Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Smalt is a blue cobalt-coloured glass pigment used in European wall paintings from the early Renaissance period that became a popular choice for artists due to its unique tone, availability, and versatility. The pigment has long been considered as stable in an alkaline environment since it was applied with lime-based techniques and generally retained its colour over time. This perceived stability has meant that aqueous-based alkaline treatments, often involving high pH values, substantial quantities of liquid, and long contact times, have been used in conservation treatments. However, studies of the kinetics of glass deterioration in the past few years have demonstrated that glass is highly reactive in contact with water and substances with both high and low pH values. Research into smalt deterioration in canvas paintings has shown that smalt is susceptible to elemental leaching and physical changes in contact with water and low pH values; however, there is little specific information about the conservation implications of these findings on the treatment of smalt in wall paintings. This experimental study explores several aspects of how aqueous-based alkaline conservation treatments affect smalt grains in lime-based wall paintings: the influence of painting technique, exposure of the pictorial layer to water before treatment, and pH values and contact times during treatment. Replicas representing three different painting techniques were created, exposed to liquid water or water vapour, and treated with three substances commonly used in conservation according to accepted practices in terms of preparation and application. Chemical and physical changes in the pigment were then analysed using scanning electron microscopy with energy dispersive X-ray spectroscopy. Results confirmed that aqueous-based alkaline substances provoke chemical changes as well as physical deterioration in smalt applied in lime-based techniques evidenced by leaching, corrosion, and cracking in the pigment grains. Crucial factors found to influence the impact of treatments on smalt included the previous exposure to humidity of the pictorial layer, the pH value of the treatment, and extended contact times. [article] Treating Smalt : A Preliminary SEM-EDX Study of the Effects of Aqueous-based Alkaline Conservation Treatments on Smalt in Wall Paintings [texte imprimé] . - 2023 . - P. 68-83. Langues : Anglais (eng) in Studies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 68-83 Catégories : Baryum -- Composés Lixiviation Microscopie électronique à balayage Peinture et décoration murales de la Renaissance -- Conservation et restauration pH -- Mesure Pigments -- Conservation et restauration -- Effets de l'eau Pigments -- Déterioration -- Méthode comparative Sels d'ammonium Solutions aqueuses (chimie) Spectroscopie des rayons X Mots-clés : Smalt Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Smalt is a blue cobalt-coloured glass pigment used in European wall paintings from the early Renaissance period that became a popular choice for artists due to its unique tone, availability, and versatility. The pigment has long been considered as stable in an alkaline environment since it was applied with lime-based techniques and generally retained its colour over time. This perceived stability has meant that aqueous-based alkaline treatments, often involving high pH values, substantial quantities of liquid, and long contact times, have been used in conservation treatments. However, studies of the kinetics of glass deterioration in the past few years have demonstrated that glass is highly reactive in contact with water and substances with both high and low pH values. Research into smalt deterioration in canvas paintings has shown that smalt is susceptible to elemental leaching and physical changes in contact with water and low pH values; however, there is little specific information about the conservation implications of these findings on the treatment of smalt in wall paintings. This experimental study explores several aspects of how aqueous-based alkaline conservation treatments affect smalt grains in lime-based wall paintings: the influence of painting technique, exposure of the pictorial layer to water before treatment, and pH values and contact times during treatment. Replicas representing three different painting techniques were created, exposed to liquid water or water vapour, and treated with three substances commonly used in conservation according to accepted practices in terms of preparation and application. Chemical and physical changes in the pigment were then analysed using scanning electron microscopy with energy dispersive X-ray spectroscopy. Results confirmed that aqueous-based alkaline substances provoke chemical changes as well as physical deterioration in smalt applied in lime-based techniques evidenced by leaching, corrosion, and cracking in the pigment grains. Crucial factors found to influence the impact of treatments on smalt included the previous exposure to humidity of the pictorial layer, the pH value of the treatment, and extended contact times.

Trim. IV(2018) - 2018-10-01 (Bulletin de Bulletin de l'Association professionnelle de conservateurs-restaurateurs d'oeuvres d'art asbl (APROA))    

Permalink

Vol.62 N°5-6(2017 ; July-August) - 2017-07-01 (Bulletin de Studies in conservation)  

Permalink

Vol.62 N°7-8(2017 ; october-November) - 2017-10-02 (Bulletin de Studies in conservation)

Permalink

Vol.63 N°5-6(2018 ; July-August) - 2018-07-02 (Bulletin de Studies in conservation)  

Permalink

Vol.64 N°5-6(2019 ; July-August) - 2019-07-01 (Bulletin de Studies in conservation)    

Permalink

Vol.65 N°5-6(2020 ; July-August) - 2020-07-01 (Bulletin de Studies in conservation)    

Permalink

Vol.66 N°1-2(2021 ; January-February) - 2021-01-01 (Bulletin de Studies in conservation) 

Permalink

---

1 (1 - 12 / 12)