28/09/2012

Cuir doré hangings in the Royal Ontario Museum by Cselenyi (1973)

Ladislav Cselenyi; Cuir doré hangings in the Royal Ontario Museum, Toronto (1973)
URL (Internet Archive)

From the text:
Like stone, wood, textile, metal, glass and other substances, leather has from time immemorial been used as a ground for painting. Such paintings are not to be confused with cuir doré, which usually consists of gilt leather pieces (or carrets) decorated by embossing, punching and painting.
The Royal Ontario Museum has acquired two important cuir dore wall hangings, the larger (PI. 1) 518.3 x 274.4 cm., the smaller (PI. 2) 265.5x266.8 cm. Mr. Heribert Hickl-Szabo, Curator of the European Department, discovered them in the possession of the Lindpaintner' family, from whom the ROM acquired them.

21/09/2012

“Dead Sea Scrolls exhibitions around the world: reasons for concern” by Rabin and Hahn (2012)

Rabin, I.; Hahn, O.; “Dead Sea Scrolls exhibitions around the world: reasons for concern”, Restaurator 33 (2) (2012) 101–121
DOI: 10.1515/res-2012-0005 (restricted access)

Abstract:
The Dead Sea Scrolls that miraculously survived for over two thousand years suffered considerable damage due to various post-discovery interventions. Today they are subjected to frequent travelling exhibitions. The current work collates the published information on exhibitions and conservational treatments with the results of the analytic studies of the skin-based material of the scrolls conducted since their discovery. The examination of the properties of the scrolls proves that frequent travel, exhibitions and the associated handling induce collagen deterioration that is covered up by the absence of a proper monitoring program.

Zusammenfassung:
Die Schriftrollen vom Toten Meer, die 2000 Jahre überdauert haben, erlitten einen erheblichen Schaden durch Behandlungen nach ihrer Entdeckung. Heute werden sie häufig zu Ausstellungen ins Ausland transportiert. In diesem Beitrag werden die vorhandenen Angaben zu den konservatorischen Eingriffen und zu den Ausstellungen zusammengefasst mit den Ergebnissen der lang-jährigen natur-wissenschaftlichen Untersuchungen von Pergament-ähnlichen Schreibunterlagen. Diese Studie weist darauf hin, dass die häufigen Reisen, die Ausstellungen, und die damit verbundenen Behandlungen, den Zerfall des Kollagens hervorrufen, der ohne geeignete Kontrolle unbemerkt fortschreitet.

Resumé:
Les Manuscrits de la Mer Morte qui ont survécu miraculeusement pendant plus de deux millénaires ont été sévèrement endommagés par les traitements auxquels ils ont été soumis après leur découverte. Aujourd’hui ils sont fréquemment transportés à l’étranger pour y être exposés. Cette étude expose les informations qui ont été recueillies sur les expositions et sur les différents traitements de restauration avec les résultats des analyses scientifiques effectuées sur les papiers parchemin et imitation parchemin. Cette étude met en évidence que les voyages fréquents, les expositions et les manipulations qui y sont associées provoquent la détérioration du collagène dont la progression risque de passer inaperçue en l’absence d’un programme de monitoring approprié.

07/09/2012

"Effects of isopropanol on collagen fibrils in new parchment" by Gonzalez et al (2012)

Gonzalez, L. G.; Hiller, J.; Terrill, N. J.; Parkinson, J.; Thomas, K.; Wess, T. J.; "Effects of isopropanol on collagen fibrils in new parchment", Chemistry Central Journal 6:24 (2012)
doi:10.1186/1752-153X-6-24 / PDF

Abstract:
Background: Isopropanol is widely used by conservators to relax the creases and folds of parchment artefacts. At present, little is known of the possible side effects of the chemical on parchments main structural component collagen. This study uses X-ray Diffraction to investigate the effects of a range of isopropanol concentrations on the dimensions of the nanostructure of the collagen component of new parchment.
Results: It is found in this study that the packing features of the collagen molecules within the collagen fibril are altered by exposure to isopropanol. The results suggest that this chemical treatment can induce a loss of structural water from the collagen within parchment and thus a rearrangement of intermolecular bonding. This study also finds that the effects of isopropanol treatment are permanent to parchment artefacts and cannot be reversed with rehydration using deionised water.
Conclusions: This study has shown that isopropanol induces permanent changes to the packing features of collagen within parchment artefacts and has provided scientific evidence that its use to remove creases and folds on parchment artefacts will cause structural change that may contribute to long-term deterioration of parchment artefacts. This work provides valuable information that informs conservation practitioners regarding the use of isopropanol on parchment artefacts.