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