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‘En route’: Identifying Thomas Fearnley’s fixatives on early 19th century pencil drawings (Abstract)

2015, 12-16 October 2015 - XIIIth IADA Congress Berlin

Our knowledge on fixatives applied onto drawings is very limited since their identification requires specialized analytical equipment. A case-study of two pencil drawings by Thomas Fearnley gave us the unique possibility to study fixatives used by 19th century artists. Thomas Fearnley (1802-1842) was a Norwegian romantic painter and gifted draughtsman. His short artistic life included several long journeys through Europe. Pencil, easily available to artists since the early 19th century, was convenient for drawing and sketching outdoors. Fearnley utilized this opportunity. The National Museum of Art, Architecture and Design in Oslo possesses about 750 of Fearnley’s drawings. Today, many of Fearnley’s drawings are badly disfigured by a fixative. Areas where the fixative was applied are either severely discoloured, or on the contrary, locally protected. This discrepancy suggested the use of different fixatives. Attempts in the 1990s to remove the fixative(s) were unsuccessful. Identification of the applied fixative(s) would allow a sound conservation strategy to be developed. While the two drawings appeared different in day light, areas with fixative fluoresced similar in UV, 365 nm. Micro-chemical spot testing excluded starch. Gas chromatography — mass spectrometry (GC-MS), determined amino acids, galactose and glucose. No hydroxyproline was present, ruling out animal glue and, by absence of arabinose and rhamnose, Gum Arabic as well. While phosphoric acid and calcium (XRF) suggested the use of milk, neither the ratio of galactose and glucose, nor the amino acids matched lactose and casein. Tests with cow milk on reference papers showed that analysis of surface samples was misleading since part of the milk penetrates into the paper substrate and remains there. What is left on the surface perfectly matched the results of the GC-MS analysis of both Fearnley drawings. Why one paper was protected and the other not, is not yet established. This was probably the first time that milk was identified as fixative on pencil drawings. This result was in agreement with various early 19th century sources, which advised the artists to use skimmed milk for this purpose. Easily available everywhere, milk was the choice of Thomas Fearnley himself when traveling and in need to protect his pencil drawings. The fixative is therefore an integral part of the artwork. Future research might reveal whether other artists applied this technique as well.

15 B. Reissland*2, T. G. Poulsson*1, H. van Keulen2, K. M. Wong3 ‘En route’ Identifying Thomas Fearnley’s fixatives on early 19th century pencil drawings Our knowledge on fixatives applied onto drawings is very limited since their identification requires specialized analytical equipment. A case-study of two pencil drawings by Thomas Fearnley gave us the unique possibility to study fixatives used by 19th century artists. Thomas Fearnley (1802-1842) was a Norwegian romantic painter and gifted draughtsman. His short artistic life included several long journeys through Europe. Pencil, easily available to artists since the early 19th century, was convenient for drawing and sketching outdoors. Fearnley utilized this opportunity. The National Museum of Art, Architecture and Design in Oslo possesses about 750 of Fearnley’s drawings. Today, many of Fearnley’s drawings are badly disfigured by a fixative. Areas where the fixative was applied are either severely discoloured, or on the contrary, locally protected (Fig 1). This discrepancy suggested the use of different fixatives. Attempts in the 1990s to remove the fixative(s) were unsuccessful. Identification of the applied fixative(s) would allow a sound conservation strategy to be developed. While the two drawings appeared different in day light, areas with fixative fluoresced similar in UV, 365 nm (Fig 2). Micro-chemical spot testing excluded starch. Gas chromatography — mass spectrometry (GC-MS), determined amino acids, galactose and glucose. No hydroxyproline was present, ruling out animal glue and, by absence of arabinose and rhamnose, Gum Arabic as well. Fig 1: Fixative protects the paper (left) or is discoloured (right). Thomas Fearnley, ’Tree, Ramsau’ and ‘St. Sebastian, Ramsau’, The National Museum of Art, Architecture and Design in day light (© B. Reissland) 30 While phosphoric acid and calcium (XRF) suggested the use of milk, neither the ratio of galactose and glucose, nor the amino acids matched lactose and casein. Tests with cow milk on reference papers showed that analysis of surface samples was misleading since part of the milk penetrates into the paper substrate and remains there. What is left on the surface perfectly matched the results of the GC-MS analysis of both Fearnley drawings. Why one paper was protected and the other not, is not yet established. This was probably the first time that milk was identified as fixative on pencil drawings. This result was in agreement with various early 19th century sources, which advised the artists to use skimmed milk for this purpose. Easily available everywhere, milk was the choice of Thomas Fearnley himself when traveling and in need to protect his pencil drawings. The fixative is therefore an integral part of the artwork. Future research might reveal whether other artists applied this technique as well. Contacting author: The National Museum of Art, Architecture and Design, Oslo, NO. Tel: +47.9360 6378, Email: tina.poulsson@nasjonalmuseet.no *1 2 Contacting author: Cultural Heritage Agency of The Netherlands (RCE), Amsterdam, NL. Tel: +31.33.4217 180, Email: B.Reissland@cultureelerfgoed.nl 3 University of Applied Science, Leiden, NL (Student) Fig 2: Fluorescence of the fixative is similar in both drawings (© B. Reissland) 12-16 October 2015 - XIII th IADA Congress Berlin