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Heritage Science
Fig. 5 | Heritage Science

Fig. 5

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. 5

a LIF spectra of test area C1a without (upper) and with (lower) fluorescence intensity normalization. Black line corresponds to the LIF recorded from the untreated/reference surface while red line corresponds to the surface that has been laser cleaned at F = 1.1 J/cm2 and 30p. b Details of the cleaned areas photographed with DINO-lite microscope in the visible (upper) and UV (lower) regions showing treated (right) and reference (left) areas (magnification ×200), c LIF spectra of test area C3b without (upper) and with (lower) fluorescence intensity normalization. Black line corresponds to the LIF recorded from the untreated/reference surface while red line corresponds to the surface that has been laser cleaned at F = 0.9 J/cm2 and 10p. d Details of the cleaned areas photographed with DINO-lite microscope in the visible (upper) and UV (lower) regions showing treated (right) and reference (left) areas (All DINO-lite images show magnification ×200)

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