What
materials are the most frequently employed for creating artworks? What were the
pigments and pictorial techniques employed by painting masters? Is it possible
to analyse human evolution and the history of technology from artworks’
studies? Could you detect art forgeries? These are just some of the questions
that you could answer thanks to the scientific study of artworks.
Some recent
publications from the University of Navarra and other Spanish and European
Institutions deal with these interesting topics . In one of
these investigations, the materials and technological knowledge used in the
manufacture and application of Roman and Arabic mortars and stuccoes from buildings
recovered from an archaeological excavation in the Real Alcazar of Seville were discussed. In this investigation, it
is shown that the Arabs arranged their mortars and stuccoes in a noticeably
different way from that of the Romans. Although in all cases lime, which was used
as the binder, was combined with aggregates based on river sand from the
depression of Guadalquivir, the binder-to-aggregate ratio and the particle-size
distribution of the aggregates exposed clear differences between fragments coming
from both cultures. After their analyses, we concluded that a decline in
knowledge about lime technology over time occurred (Archaeometry 56, 4 (2014):
541-561).
On the
other hand, some knowledge of human evolution could be achieved by studying
prehistoric rock art, as it was recently demonstrated in a study performed on black
prehistoric drawings in the cave of Rouffignac (France) dated 13,000 years ago
(Talanta 129 (2014): 459-464). Paintings represent horses, ibexes, mammoths,
bisons and rhinoceros. Two manganese oxides, pyrolusite (MnO2) and
romanechite (Ba2Mn5O10), were employed by the
ancient artists. The nature and microstructure of manganese oxides can provide
information about the provenance of the supplying sites, giving clues about some
prehistoric human aspects. The experiments were performed by using a portable
system coupling X-ray diffraction and X-ray fluorescence in the same apparatus.
This equipment allowed a non-invasive analysis of the artworks, providing a
complete characterization of the work.
The same apparatus
was also employed in the analysis of a royal 15th century
illuminated parchment, in which King Henry IV of Castile (1425-1474) conferred
nobility on Gil Fernandez and Alonso Covo. Thanks to the study of this artwork,
now preserved at the Archive of the Royal Chancellery of Granada, the
reconstruction of its documentary archaeology was possible and this served as an
initial point in the comparative study with similar works. Some of the
materials employed in the decoration were gold and silver, vermilion and minium
(red colour), azurite (blue), malachite (green) and lead tin oxide (yellow).
For the parchment text, iron-based ink was employed (Journal of Archaeological
Science 45 (2014): 52-58).
In the last
years, studies regarding cultural heritage have increased and many scientists are
devoted to this research field. With a better Knowledge of the past, perhaps we
can improve our future…
Adrian Duran
Professor
School of Sciences
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