Abstract
Gregório Lopes is one of the most famous Portuguesepainters of the 15th–16th centuries. This work is a contribution to thestudy of his painting technique, specifically addressing the methodologyused in the preparation of ground layers, which has never been carried outpreviously with this multianalytical method.For this purpose characterization of the ground layers of a selection of hispaintings was carried out by micro-Energy Dispersive X-ray Fluorescencespectroscopy (μ-EDXRF), micro-X-ray Diffraction (μ-XRD), ScanningElectron Microscopy - Energy Dispersive Spectroscopy (SEM-EDS) andcomplemented by micro-Raman spectroscopy. This work presents the resultsobtained on two altarpieces (c.1544) produced at the same period by thisPortuguese artist. Ground layers are composed mainly of calcium sulfate —anhydrite and gypsum — and other compounds such as dolomite. Referencesamples were prepared to obtain diffraction pattern of different percentageof gypsum and anhydrite and compared with the results from historicalsamples.
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