Fig. 4From: In-situ multi-analytical characterization of original and decay materials from unique wall mirrors in the House of Gilded Cupids, Pompeiia LIBS spectra in the NIR wavelength region (600–1000 nm) collected from the silicate-based matrix of Mirror 1, analysing several times on the same spot. b Graph showing how the intensity of the main hydrogen emission line decreases as a function of the number of laser shotsBack to article page