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3-D Tomography Aids Understanding of 19th Century Paintings

By R&D Editors | March 29, 2011

3-D Tomography Aids Understanding of 19th Century Paintings

The Swiss Institute for Art Research (SIK-ISEA) is studying the studio practice of Swiss painters of the late 19th and early 20th century, the materials they used for their paintings, and the deterioration processes the paintings undergo as they age. Among other issues, this study is looking at the paintings’ grounds, which are mixtures of binding media, fillers and pigments applied to a suitable support as a preparation for painting. In particular, it has set a focus on the possible connection between the porosity of grounds, their absorption characteristics, the overall appearance and the stability of the paintings.

Many different recipes for the preparation of lean and relatively absorbent grounds can be found in technical sources written since the late 17th century. There are a number of reasons why most artists preferred them: They soak up some of the binding medium of the paint, thus shortening its drying process and resulting in a good adhesion between ground and paint. From the end of the 19th century onward, the fact that absorbent grounds lead to brightly colored and matte picture surfaces was very much appreciated by painters that had ceased to work in the academic style.

In attempting to characterize the degree of porosity or the capability of a ground to incorporate moisture, the study addresses a pressing conservation question: The presence of an absorbing layer within the painting build-up has important consequences for the painting’s stability. Issues of water-accelerated reactivity and moisture gradient-assisted material mobility within complex paint systems have been recognized but never studied. The characterization of the structure of absorbent ground layers is a first step toward the study of the mobility of materials between layers.

Recent research at the Art technology department of SIK-ISEA, in collaboration with TOMCAT beamline at PSI Villigen, has shown that X-ray tomography is a uniquely powerful method to study the internal structure in intact ground samples. The current research challenge is twofold and lies in

1. estimating precisely the distribution of voids and pores and the connectivity of the porosity network at a micrometer scale

2. visualizing the impregnation and transport of moisture through the ground

The 3-D tomographic data sets are being studied using Avizo software, which enables visualization and quantitative analysis of the data sets by providing appropriate filtering algorithms and advanced segmentation tools. Avizo software is a multifaceted tool for visualizing, manipulating and understanding scientific and industrial data in materials and physical sciences, engineering applications, non-destructive testing, and earth sciences.

Citation: Ferreira E. S. B., J .J. Boon, J. van der Horst, N.C. Scherrer, F. Marone and M. Stampanoni, 2009. 3D Synchrotron X-ray microtomography of paint samples. O3A: Optics for Arts, Architecture, and Archaeology II, edited by Luca Pezzati, Renzo Salimbeni, Proc. of SPIE Vol. 7391, 73910L • © 2009 SPIE • doi: 10.1117/12.827511.

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