Investigation into 20th century polychromed concrete modelled sculpture by Peter Laszlo Peri and assessment of efficacy of technical analysis on concrete substrates

Summary

In collaboration with Peter Laszlo Peri Estate, investigated the polychromy of his concrete sculptures made between 1930 - 1955 by taking raw samples and subjecting it to series of technical analysis including FTIR, XRF,XRD, Raman spectroscopy, and SEM EDX. 

The study was able to determine set of palette including iron oxide red and yellow, carbon black, and phthalo blue. The pigments were bound in water diluted cement, portland cement in particular, or gypsum. Peri manipulated the consistency of the paint by the ratio of water to binder. 

FTIR, Raman, and SEM EDX, as well as optical microscopy proved informative while XRF and XRD require larger sample size. 

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Woman in red hair (1945) and Portrait of a woman (1939) by Peter Peri

Top) Close up of polychromed surface

Bottom) Space construction with two figures (1955)

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Red iron oxide                                                            Yellow iron oxide                                                Phthalocyanine blue 

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Cross section sample example in

Left) white light

Top Left) UV light

Top Right) UV light with gypsum staining 

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SEM image of concrete sample 

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Example of Raman spectroscopy identifying phthalo blue