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Organisationseinheit der BAM
- 4 Material und Umwelt (7)
- 4.5 Kunst- und Kulturgutanalyse (7)
- 6 Materialchemie (6)
- 6.6 Physik und chemische Analytik der Polymere (6)
- 5 Werkstofftechnik (2)
- 5.1 Mikrostruktur Design und Degradation (2)
- 6.3 Strukturanalytik (2)
- 6.5 Synthese und Streuverfahren nanostrukturierter Materialien (2)
- 8 Zerstörungsfreie Prüfung (2)
- 8.4 Akustische und elektromagnetische Verfahren (2)
Eingeladener Vortrag
- nein (3)
We studied the oxidation and migration processes of inorganic compounds in iron gall inks with a combination of micro X-ray fluorescence analysis (micro-XRF) and micro X-ray absorption near edge structure spectroscopy (micro-XANES). With elemental mapping by micro-XRF, the correlation of the minor elements in the ink to the major element Fe was investigated. Along concentration profiles of Fe, micro-XANES measurements were carried out in order to determine the oxidation state and the local environment. With the help of model inks, we could show that Cu is a further important element in the paper degradation process due to iron gall ink corrosion.
Censorship of parts of written text was and is a common practice in totalitarian regimes. It is used to destroy information not approved by the political power. Recovering the censored text is of interest for historical studies of the text. This paper raises the question, whether a censored postcard from 1942 can be made legible by applying multispectral imaging in combination with laser cleaning. In the fields of art conservation (e.g. color measurements), investigation (e.g. Analysis of underdrawings in paintings), and historical document analysis, multispectral imaging techniques have been applied successfully to give visibility to information hidden to the human eye.
The basic principle of laser cleaning is to transfer laser pulse energy to a contamination layer by an absorption process that leads to heating and evaporation of the layer. Partial laser cleaning of postcards is possible; dirt on the surface can be removed and the obscured pictures and writings made visible again. We applied both techniques to the postcard. The text could not be restored since the original ink seems to have suffered severe chemical damage.
A combination of 3D micro X-ray fluorescence spectroscopy (3D micro-XRF) and micro-XRF was utilized for the investigation of a small collection of highly heterogeneous, partly degraded Dead Sea Scroll parchment samples from known excavation sites. The quantitative combination of the two techniques proves to be suitable for the identification of reliable marker elements which may be used for classification and provenance studies. With 3D micro-XRF, the three-dimensional nature, i.e. the depth-resolved elemental composition as well as density variations, of the samples was investigated and bromine could be identified as a suitable marker element. It is shown through a comparison of quantitative and semiquantitative values for the bromine content derived using both techniques that, for elements which are homogeneously distributed in the sample matrix, quantification with micro-XRF using a one-layer model is feasible. Thus, the possibility for routine provenance studies using portable micro-XRF instrumentation on a vast amount of samples, even on site, is obtained through this work.
Parchment has been in use for thousands of years
and has been used as the writing or drawing support for
many important historic works. A variety of analytical
techniques is currently used for routine assessment of the
degree of denaturation of historic parchment; however,
because parchment has a heterogeneous nature, analytical
methods with high spatial resolution are desirable. In this
work, the use of small-angle X-ray scattering (SAXS) and
synchrotron-IR (SR-IR) was examined in conjunction with
multivariate data analysis to study degradation of an
extended set of historic parchment samples, and particularly
to investigate the effect of lipids and the presence of iron
gall ink on the degradation processes. In the data analysis,
shrinkage temperature, lipid content, sample age, presence
of ink and accelerated degradation were included. The
analysis of loading factors in partial least-squares regression
and principal component analyses based on SAXS, SR-IR
and other analytical and descriptive data reveals the effect
of lipid removal on diffraction patterns, and lipids are found
to cause the degradation process in parchment to accelerate.
The effect of iron gall ink is also evident, although the
mechanism of ageing is different to that of natural ageing in
the absence of ink. In addition, a historic parchment score
from ca. 1750 is examined, demonstrating the significant
effect of iron gall ink, and lipids and inorganic soiling on its
increased degradation.
The aim of the research project 'Typology of
Dutch Drawing' was to establish an interdisciplinary approach
for investigating heterogeneous drawing collections.
To define a type common to a group of drawings, we
determine elements that are common to them based on style
and the use of identical materials. To that end, we investigated
about 750 Dutch drawings from the sixteenth century at the
Dresden Kupferstich-Kabinett using art historical and
scientific methods. In this work, we present a detailed
analysis of 30 drawings ascribed to the Egmont Master.
The Erfurt Hebrew Giant Bible and the Experimental XRF Analysis of Ink and Plummet Composition
(2007)
Remake of ancient green
(2006)