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

Conservation of the Shaft #1 Headgear at the Tsumeb Mine, Namibia 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. 228-242 Titre : Conservation of the Shaft #1 Headgear at the Tsumeb Mine, Namibia : Corrosion Protection Type de document : texte imprimé Année de publication : 2023 Article en page(s) : P. 228-242 Note générale : Article en libre accès (open access). https://www.tandfonline.com/doi/full/10.1080/00393630.2021.2004007 Langues : Anglais (eng) Catégories : Acier -- Composition chimique Acier de construction -- Corrosion -- Analyse Acier de construction -- Corrosion -- Mesure Anticorrosifs -- Conservation et restauration Assemblages à rivets -- Afrique du Sud-Ouest -- 20e siècle Constructions métalliques -- Afrique du Sud-Ouest -- 20e siècle -- Corrosion Constructions métalliques -- Afrique du Sud-Ouest -- Effets du climat Microscopie électronique à balayage Mines (sites d'extraction) -- Namibie -- Conservation et restauration Patrimoine industriel -- Namibie -- Protection Résines alkydes Spectroscopie des rayons X Stabilisants -- Conservation et restauration Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : The Tsumeb Mine in Namibia represents one of the best-preserved mining sites in the world and is rapidly gaining cross-disciplinary interest among cultural and engineering scientists. Most of the open pit and the shaft mining equipment are still in place, including the ore processing units and the local power plant. The mining area thus deserves recognition as an industrial world heritage site, especially due to the rarity of such locations on the African continent. The Shaft #1 headgear, built in 1924, represents one of the oldest known riveted steel headgears of the Promnitz design worldwide. In contrast to similar steel structures located in the northern hemisphere, it has been exposed to a different rural semi-arid climate since it is located in the Otavi Mountain Land, characterized by semi-annual change of rainy and dry seasons. Parts of the Shaft #1 headgear have remained largely untouched for more than 70 years. Besides its outstanding heritage value, it thus also represents an interesting object for studying the composition of corrosion layers formed on mild steel surfaces when exposed to continental and industrial mining atmospheres. To find a suitable transparent corrosion prevention coating, various on-site coating samples were evaluated after 11 months of outdoor exposure, including Owatrol Oil®, which is based on natural oil and alkyd resin with strong wicking potential. The substance is frequently applied for the conservation of single components but is not yet widely used on large steel structures in the field of industrial heritage conservation. However, it represented the most stable anti-corrosion coating under the local atmospheric conditions in the on-site tests. Thus, the suitability of Owatrol Oil® as a transparent coating for corrosion protection of riveted mild steel structures in such climates was further investigated as a more recent approach for the conservation of large steel structures. Since the protective coatings are exposed to strong UV radiation in the local climate, the addition of a specific UV stabilizer mixture was also tested. For such laboratory tests, two mild steel samples were taken. The first one originated from a diagonal strut of the 1920s and the second one from a handrail mounted in the early 1960s. Using corresponding high-resolution scanning electron microscopy (HR-SEM) and energy-dispersive X-ray spectroscopy (EDX) it was found that the corrosion layers are predominantly composed of lepidocrocite and goethite. A weathering program simulating the specific environmental conditions at Tsumeb in a UV climate chamber was developed and the corrosion resistance of the mild steel surface was subsequently evaluated by potentiodynamic measurements. Such tests proved to be a fast and reliable procedure for ranking the corrosion resistance of the old mild steels. It was found that the long-term corrosion layers already provide significant protection against further corrosion in the simulated environment. However, the study also showed that this can be further improved by the application of the Owatrol Oil® as a protective coating that also seals crevices. The addition of the UV stabilizers, however, led to a significant deterioration in corrosion protection, even in comparison to that of the uncoated long-term corrosion layers on the surface. Regular overcoating seems more advisable for the long-term preservation of the Shaft #1 headgear than modifying the Owatrol Oil® coating with the tested UV-stabilizing additives. [article] Conservation of the Shaft #1 Headgear at the Tsumeb Mine, Namibia : Corrosion Protection [texte imprimé] . - 2023 . - P. 228-242. Article en libre accès (open access). https://www.tandfonline.com/doi/full/10.1080/00393630.2021.2004007 Langues : Anglais (eng) in Studies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 228-242 Catégories : Acier -- Composition chimique Acier de construction -- Corrosion -- Analyse Acier de construction -- Corrosion -- Mesure Anticorrosifs -- Conservation et restauration Assemblages à rivets -- Afrique du Sud-Ouest -- 20e siècle Constructions métalliques -- Afrique du Sud-Ouest -- 20e siècle -- Corrosion Constructions métalliques -- Afrique du Sud-Ouest -- Effets du climat Microscopie électronique à balayage Mines (sites d'extraction) -- Namibie -- Conservation et restauration Patrimoine industriel -- Namibie -- Protection Résines alkydes Spectroscopie des rayons X Stabilisants -- Conservation et restauration Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : The Tsumeb Mine in Namibia represents one of the best-preserved mining sites in the world and is rapidly gaining cross-disciplinary interest among cultural and engineering scientists. Most of the open pit and the shaft mining equipment are still in place, including the ore processing units and the local power plant. The mining area thus deserves recognition as an industrial world heritage site, especially due to the rarity of such locations on the African continent. The Shaft #1 headgear, built in 1924, represents one of the oldest known riveted steel headgears of the Promnitz design worldwide. In contrast to similar steel structures located in the northern hemisphere, it has been exposed to a different rural semi-arid climate since it is located in the Otavi Mountain Land, characterized by semi-annual change of rainy and dry seasons. Parts of the Shaft #1 headgear have remained largely untouched for more than 70 years. Besides its outstanding heritage value, it thus also represents an interesting object for studying the composition of corrosion layers formed on mild steel surfaces when exposed to continental and industrial mining atmospheres. To find a suitable transparent corrosion prevention coating, various on-site coating samples were evaluated after 11 months of outdoor exposure, including Owatrol Oil®, which is based on natural oil and alkyd resin with strong wicking potential. The substance is frequently applied for the conservation of single components but is not yet widely used on large steel structures in the field of industrial heritage conservation. However, it represented the most stable anti-corrosion coating under the local atmospheric conditions in the on-site tests. Thus, the suitability of Owatrol Oil® as a transparent coating for corrosion protection of riveted mild steel structures in such climates was further investigated as a more recent approach for the conservation of large steel structures. Since the protective coatings are exposed to strong UV radiation in the local climate, the addition of a specific UV stabilizer mixture was also tested. For such laboratory tests, two mild steel samples were taken. The first one originated from a diagonal strut of the 1920s and the second one from a handrail mounted in the early 1960s. Using corresponding high-resolution scanning electron microscopy (HR-SEM) and energy-dispersive X-ray spectroscopy (EDX) it was found that the corrosion layers are predominantly composed of lepidocrocite and goethite. A weathering program simulating the specific environmental conditions at Tsumeb in a UV climate chamber was developed and the corrosion resistance of the mild steel surface was subsequently evaluated by potentiodynamic measurements. Such tests proved to be a fast and reliable procedure for ranking the corrosion resistance of the old mild steels. It was found that the long-term corrosion layers already provide significant protection against further corrosion in the simulated environment. However, the study also showed that this can be further improved by the application of the Owatrol Oil® as a protective coating that also seals crevices. The addition of the UV stabilizers, however, led to a significant deterioration in corrosion protection, even in comparison to that of the uncoated long-term corrosion layers on the surface. Regular overcoating seems more advisable for the long-term preservation of the Shaft #1 headgear than modifying the Owatrol Oil® coating with the tested UV-stabilizing additives.

Les gommes à effacer utilisées en conservation-restauration des photographies / Emmanuelle Grosso in Conservation restauration des biens culturels (CRBC), no.8(1996:oct.) (1996-10-01)

Public ISBD [article]  inConservation restauration des biens culturels (CRBC) > no.8(1996:oct.) (1996-10-01) . - P. 49-54 Titre : Les gommes à effacer utilisées en conservation-restauration des photographies : junior Type de document : texte imprimé Auteurs : Emmanuelle Grosso, Auteur Année de publication : 1996 Article en page(s) : P. 49-54 Langues : Français (fre) Catégories : Beilstein, Friedrich Konrad (1838-1906) Essais (technologie) Gommes et résines -- Recherche Microscopie électronique à balayage Photographie -- Nettoyage Spectroscopie des rayons X Spectroscopie infrarouge Index. décimale : 7.025 Dommages. Conservation. Protection [article] Les gommes à effacer utilisées en conservation-restauration des photographies : junior [texte imprimé] / Emmanuelle Grosso, Auteur . - 1996 . - P. 49-54. Langues : Français (fre) in Conservation restauration des biens culturels (CRBC) > no.8(1996:oct.) (1996-10-01) . - P. 49-54 Catégories : Beilstein, Friedrich Konrad (1838-1906) Essais (technologie) Gommes et résines -- Recherche Microscopie électronique à balayage Photographie -- Nettoyage Spectroscopie des rayons X Spectroscopie infrarouge Index. décimale : 7.025 Dommages. Conservation. Protection

Investigations of Painting Techniques : Edirne Süleyman Pasha Mosque Wall Paintings in Studies in conservation, Vol.68 N°3-4(2023; April-May) (2023-04-03)

Public ISBD [article]  inStudies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 418-431 Titre : Investigations of Painting Techniques : Edirne Süleyman Pasha Mosque Wall Paintings Type de document : texte imprimé Année de publication : 2023 Article en page(s) : Pages 418-431 Langues : Anglais (eng) Catégories : Edirne (Turquie) -- Selimiye camisi Fourier, Spectroscopie infrarouge à transformée de Microscopie électronique à balayage Mosquées -- Turquie -- Conservation et restauration Peinture à fresque -- Empire ottoman -- Technique Peinture et décoration murales -- Empire ottoman -- Conservation et restauration Peinture et décoration murales -- Empire ottoman -- Technique Peinture et décoration murales -- Matériaux -- Analyse Spectroscopie des rayons X Spectroscopie Raman Mots-clés : Kalem işi Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : ABSTRACT Decorative wall paintings created in the Ottoman era are called kalem işi, and they are generally created using various pigments and binding media on dry rendering, or via lime-paint technique. However, detection of some decorative wall paintings that were applied on wet plaster in Süleyman Pasha Mosque located in Edirne, Turkey, has led to a more detailed analytical examination. Our study aims to research the techniques used on some painting fragments which were found while removing cement renderings during the restoration of the Mosque. The fragments were revealed in 2019 and were taken under protection as these were stylistically different from the existing paintings of the Mosque. The original location of the fragments on the wall could not be located and in situ conservation is not possible, but research continues. Initially, traces of preparatory drawing, which is thought to be the incising technique, were found on the paintings drawn on the rendering fragments. Then, SEM-EDX, FTIR spectroscopy, confocal Raman spectroscopy, and PED-XRF analyses were carried out along with examinations by optical microscopy. Following these results, experimental reconstructions of the paintings were made on test materials and a story about the painting techniques was revealed, indicating that these paintings were drawn on wet rendering (fresco). Therefore, it is considered that there may be different wall painting techniques in Ottoman architecture and that research in this direction should be increased. [article] Investigations of Painting Techniques : Edirne Süleyman Pasha Mosque Wall Paintings [texte imprimé] . - 2023 . - Pages 418-431. Langues : Anglais (eng) in Studies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 418-431 Catégories : Edirne (Turquie) -- Selimiye camisi Fourier, Spectroscopie infrarouge à transformée de Microscopie électronique à balayage Mosquées -- Turquie -- Conservation et restauration Peinture à fresque -- Empire ottoman -- Technique Peinture et décoration murales -- Empire ottoman -- Conservation et restauration Peinture et décoration murales -- Empire ottoman -- Technique Peinture et décoration murales -- Matériaux -- Analyse Spectroscopie des rayons X Spectroscopie Raman Mots-clés : Kalem işi Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : ABSTRACT Decorative wall paintings created in the Ottoman era are called kalem işi, and they are generally created using various pigments and binding media on dry rendering, or via lime-paint technique. However, detection of some decorative wall paintings that were applied on wet plaster in Süleyman Pasha Mosque located in Edirne, Turkey, has led to a more detailed analytical examination. Our study aims to research the techniques used on some painting fragments which were found while removing cement renderings during the restoration of the Mosque. The fragments were revealed in 2019 and were taken under protection as these were stylistically different from the existing paintings of the Mosque. The original location of the fragments on the wall could not be located and in situ conservation is not possible, but research continues. Initially, traces of preparatory drawing, which is thought to be the incising technique, were found on the paintings drawn on the rendering fragments. Then, SEM-EDX, FTIR spectroscopy, confocal Raman spectroscopy, and PED-XRF analyses were carried out along with examinations by optical microscopy. Following these results, experimental reconstructions of the paintings were made on test materials and a story about the painting techniques was revealed, indicating that these paintings were drawn on wet rendering (fresco). Therefore, it is considered that there may be different wall painting techniques in Ottoman architecture and that research in this direction should be increased.

Preventive Conservation, Treatment, and Technical Study of Plasticized Poly(vinyl chloride) Multiples by Joseph Beuys / Nicole Ledoux in Studies in conservation, Vol.68 N°3-4(2023; April-May) (2023-04-03)  

Public ISBD [article]  inStudies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 343-356 Titre : Preventive Conservation, Treatment, and Technical Study of Plasticized Poly(vinyl chloride) Multiples by Joseph Beuys Type de document : texte imprimé Auteurs : Nicole Ledoux, Auteur Année de publication : 2023 Article en page(s) : Pages 343-356 Langues : Anglais (eng) Catégories : Beuys, Joseph (1921-1986) Chambres froides Chlorure de polyvinyle Chromatographie en phase gazeuse Matières plastiques -- Dans l'art -- Analyse Matières plastiques -- Dans l'art -- Conservation et restauration Matières plastiques -- Dans l'art -- Séchage Microscopie électronique à balayage Plastifiants Spectrométrie de masse Spectroscopie des rayons X Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : ABSTRACT Works of art made of plasticized poly(vinyl chloride) (PVC) present unique and pressing conservation challenges. Due to inherently unstable formulations, PVC can deteriorate rapidly, producing dramatic alterations that were unanticipated by artists and collectors. This is the case for three works by Joseph Beuys with PVC components in the Harvard Art Museums’ collection: Phosphorus-Cross Sled, Postcards 1968–1974, and Stamp Sculpture. Over the course of the last two decades, exudation of liquid plasticizer and progressive discoloration of the PVC was observed and appeared to be worsening with time. This paper presents the results of research undertaken since 2012 to develop storage and display guidelines that will slow the deterioration and improve the accessibility of these works. The three objects under study are all multiples, meaning that they were released in editions, which are now dispersed across numerous museums and private collections. Analysis using gas chromatography-mass spectrometry (GC-MS, with and without pyrolysis) and scanning electron microscopy with energy dispersive X-ray (SEM-EDX) spectroscopy has identified variability in the PVC formulation and exudate across different multiples, suggesting that they may derive from different manufacturing batches. Experimental testing of PVC material from Beuys’s studio has shown that sealed Mylar enclosures and storage at temperatures between 4.4 and 12.8 °C are effective in slowing the migration of plasticizer to the surface. After implementing these changes to the housing and storage of the PVC postcard from Postcards 1968–1974, reabsorption of plasticizer exudate was observed, demonstrating that reversal of the plasticizer migration is possible under these conditions. En ligne : https://www.tandfonline.com/doi/full/10.1080/00393630.2022.2033520 [article] Preventive Conservation, Treatment, and Technical Study of Plasticized Poly(vinyl chloride) Multiples by Joseph Beuys [texte imprimé] / Nicole Ledoux, Auteur . - 2023 . - Pages 343-356. Langues : Anglais (eng) in Studies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 343-356 Catégories : Beuys, Joseph (1921-1986) Chambres froides Chlorure de polyvinyle Chromatographie en phase gazeuse Matières plastiques -- Dans l'art -- Analyse Matières plastiques -- Dans l'art -- Conservation et restauration Matières plastiques -- Dans l'art -- Séchage Microscopie électronique à balayage Plastifiants Spectrométrie de masse Spectroscopie des rayons X Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : ABSTRACT Works of art made of plasticized poly(vinyl chloride) (PVC) present unique and pressing conservation challenges. Due to inherently unstable formulations, PVC can deteriorate rapidly, producing dramatic alterations that were unanticipated by artists and collectors. This is the case for three works by Joseph Beuys with PVC components in the Harvard Art Museums’ collection: Phosphorus-Cross Sled, Postcards 1968–1974, and Stamp Sculpture. Over the course of the last two decades, exudation of liquid plasticizer and progressive discoloration of the PVC was observed and appeared to be worsening with time. This paper presents the results of research undertaken since 2012 to develop storage and display guidelines that will slow the deterioration and improve the accessibility of these works. The three objects under study are all multiples, meaning that they were released in editions, which are now dispersed across numerous museums and private collections. Analysis using gas chromatography-mass spectrometry (GC-MS, with and without pyrolysis) and scanning electron microscopy with energy dispersive X-ray (SEM-EDX) spectroscopy has identified variability in the PVC formulation and exudate across different multiples, suggesting that they may derive from different manufacturing batches. Experimental testing of PVC material from Beuys’s studio has shown that sealed Mylar enclosures and storage at temperatures between 4.4 and 12.8 °C are effective in slowing the migration of plasticizer to the surface. After implementing these changes to the housing and storage of the PVC postcard from Postcards 1968–1974, reabsorption of plasticizer exudate was observed, demonstrating that reversal of the plasticizer migration is possible under these conditions. En ligne : https://www.tandfonline.com/doi/full/10.1080/00393630.2022.2033520

Restauration d'une icône représentant les deux prophètes Moïse et Samuel surmontés du patriarche Jacob, école de Pskov, Russie XVIIe siècle (collection du musée Pskov) / Ella Tushinskaya in Conservation restauration des biens culturels (CRBC), no.11(1998:mai) (1998-05-01)

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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)  

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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)  

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Technologie, analyse, conservation et restauration des enduits peints de Bösingen et de Vallon / Cyril Benoît ; Olivier Guyot ; Peter Berner in Conservation restauration des biens culturels (CRBC), no.23(2005) (2005-12-01)

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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)

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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)

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Treatment of the stained glass windows of Astorga Cathedral (León - Spaint) using cleaning gels / Andrés Sánchez ; Isabel Herráez ; Valentín Nieves in Conservation restauration des biens culturels (CRBC), no.9(1997:mai) (1997-05-01)

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

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Utilisation de la fluorescence X in situ / Christian Binet in Conservation restauration des biens culturels (CRBC), no.24(2006) (2006-12-01)

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

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