Francis Williams: Shedding light on the production, materials and techniques of the portrait of a Jamaican scholar

The Victoria and Albert Museum holds an important portrait of the Jamaican scholar and writer Francis Williams (c.1692- 1762), portrayed as a scholar
in his study. It is believed to have been painted around 1745 by an unknown
artist, but the circumstances of its production are unknown. A technical exam
ination of the painting was performed using x-radiography and infrared reflec
tography (IRR), macro x-ray fluorescence scanning (XRF), digital microscopy,
scanning electron microscopy with energy-dispersive x-ray spectroscopy
(SEM–EDX) and reflectance imaging spectroscopy in the short-wave infrared
(SWIR). XRF, IRR and reflectance imaging spectroscopy in the SWIR revealed
the distribution of inorganic pigments including lead white, earth pigments,
Prussian blue, vermilion, orpiment (or pararealgar) and bone or ivory black.
Pentimenti and a different sketched landscape were observed in the IRR
images, highlighting changes in the final composition. Three-dimensional
(3D) digital microphotography provided additional historical and contextual
information through the observation of book titles and details. High-resolution
digital imaging complemented analytical data. Results of the technical exami
nation revealed the material composition and the development of the painting,
contributing to shed new light on the production of the portrait, the history
and significance of the portrait.