Notice catalographique « Replicating dammar : practical study on a blended varnish of Paraloid™B72 and Laropal®A81 »
- Titre
- Replicating dammar : practical study on a blended varnish of Paraloid™B72 and Laropal®A81
- Auteur ou éditeur
- L'Heureux, Ève
- Queen's University (Kingston, ON)
- Lieu de publication
- Kingston, ON
- Maison d'édition
- Queen's University
- Date de publication
- 2023
- Collation
- v, 34 pages : charts, tables ; 28 cm
- Série
- Queen's Master in Art Conservation
- Résumé
- Based on a research conducted by Arslanoglu and Learner in 2001 analyzing the optical, chemical and aging properties of a varnish composed of a mix of Paraloid™B72 and Laropal®A81, the present study aimed at evaluating unexplored parameters in the use of this varnish, which was first designed as a stable substitute to dammar. The first step served to establish if the phase separation of the two resins noticed in the 2001 research could be mitigated by changing the solvents used and adjusting the proportion of each resin. The solvents selected were xylene, 1-methoxy-2-propanol, and ethyl acetate. Drops of varnish mixtures with predetermined proportions of each resin were examined under the microscope to evaluate phase separation and levelling properties. Changing the solvent proved to have, indeed, an effect on the miscibility of the two resins and mitigated phase separation. To assess if the solvents used could influence dirt deposition, the same slides were exposed to a busy, dirty environment for six weeks, and gloss measurements taken before and after showed which mixtures attracted or imbibed dust. Some tendencies were observed for specific mixtures, for example 1-methoxy-2-propanol 10% attracted more dirt, but regained most of its gloss after a light dusting, indicating it does not imbibe dirt. For the third step, five varnish solutions showing the least phase separation, the smallest particles and the best levelling properties were selected and applied onto test panels mimicking damaged oil paintings. This served to establish the capacity of the selected varnish mixtures to unify gloss and colour saturation across a painting, despite damage. A glossmeter and a colour spectrophotometer were used to quantify the differences at this stage. Only one varnish mixture fulfilled both requirements, ethyl acetate 50%. Finally, the practical handling characteristics of the selected synthetic varnish mixture was compared to dammar by varnishing two test canvases, one for each varnish. The flow, drying rate and the possibility to adjust gloss while brushing were qualitatively evaluated and compared. It showed that the synthetic varnish, even if its handling properties were different than dammar, allowed to achieve similar effects. The results gathered with this research contributed to assess this varnish’s efficiency, its similarity to dammar and to develop an optimal method for its use in art conservation practice.
- Notes
- Thesis (M.A.) -- Queen's University, 2023
- Langue
- English = Anglais
- Sujet
- Varnish and varnishing - Analysis
- Varnish and varnishing - Testing
- Art objects - Conservation and restoration
- Vernis - Analyse
- Vernis - Essais
- Objets d'art - Conservation et restauration
- Pays
- Canada
- Type de document
- Monograph = Monographie
- Localisation
- TP 938 H48 2023
- Clé
- 19934
- Collection
- Catalogue