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Heritage Science
Fig. 3 | Heritage Science

Fig. 3

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. 3

a Varnish surface maps of the test areas C3a and C3b before (left) and after cleaning (right) rendered from OCT data. b Map of the varnish thickness change after laser cleaning obtained from OCT data, red rectangles indicate areas used for averaging the thickness of removed material given in Table 1

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