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Fig. 2 | Heritage Science

Fig. 2

From: Laser cleaning of paintings: in situ optimization of operative parameters through non-invasive assessment by optical coherence tomography (OCT), reflection FT-IR spectroscopy and laser induced fluorescence spectroscopy (LIF)

Fig. 2

OCT and reflection FT-IR results for the laser cleaning performed on the test areas C3b and C3a of the Floral painting. C3b area (0.9 J/cm2 and 10 pulses): a OCT tomogram recorded before the cleaning; b reflection FT-IR spectra collected before (black line) and after (red line) the cleaning (G, gypsum; Ox, calcium oxalates); c OCT tomogram of the cleaned area. C3a area (0.9 J/cm2 and 20 pulses): d OCT tomogram recorded before the cleaning; e reflection FT-IR spectra collected before (black line) and after (red line) laser cleaning. Spectra of the overpaint (green line) and of the original paint layer (blue line) uncovered (p, proteinaceous component) are also given for comparison; f OCT tomogram of the cleaned area. In the OCT tomograms layer thickness is also reported; bars represent 200 μm in both directions. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article)

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