Dataset for the paper ???Mart??nez-Weinbaum, M.; Lozano-Carb??, M.; Maestro-Guijarro, L.; Carmona-Quiroga, P.M.; Oujja, M.; Castillejo, M., Comparison of the Use of Traditional Solvents and Nanosecond 213 nm Nd:YAG Laser in Thinning Naturally Aged Varnish on a Contemporary Oil Easel Painting. Heritage. 2023, 6(2), 957-967.???

The study was undertaken in a contemporary oil easel painting which was temporarily loaned from the Restoration-Conservation Laboratory of the Faculty of Fine Arts of the University of Barcelona. Different varnish removal procedures were assessed over this painting, and, in order to analyse and compare the efficiency of the methods, several non-invasive and invasive techniques were applied. This dataset consists of images of the artwork (general and detail) and the results of the different cleaning procedures; the varnish removal test conditions performed; Laser-induced Breakdown Spectroscopy (LIBS) spectra; Laser-induced Fluorescence (LIF) spectra; and Fourier-transform infrared spectroscopy (FTIR Spectroscopy). This information allows for assessing the results achieved with each cleaning methodology. Images are presented in JPG format. All spectra are presented in CSV format, on a single page. Descriptions of the selected areas and the experimental conditions in which the spectra were taken and the name of the column values are included at the top of each page. To illustrate the artwork, we took one image of the painting considered in the study (Fig. 1) and a general image under UV light of the picture (Fig. 2). Additionally, we can see the outcomes of varnish removal in the detail photos digital microscopy images (Fig. 3), and in detail UV light photograph of one of the cleaned areas (Fig. 4). For kinetic LIBS, 1 file per each uncleaned and cleaned by different methods area is included. Each file is composed of 41 columns, the first one (x) for wavelength and, the other 40 (y) for intensity. For LIF, 1 file per sample of the analysis of the fluorescence of each un/cleaned area. Each file is composed of 2 columns (wavelength and intensity). For FTIR, 1 file for the characterisation of the varnish, which is composed of 2 columns, the first one indicates the wavenumber (x), and the second one the transmittance (y).