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Fig. 4 | Heritage Science

Fig. 4

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. 4

OCT and reflection FT-IR results for the laser cleaning performed on test area C1a of the Floral painting (1.1 J/cm2 and 30 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). Spectrum of the original paint layer (blue line) uncovered (p, proteinaceous component) is also given for comparison; c OCT tomogram of the cleaned area. 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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