Multispectral and hyperspectral image analysis of elemental and micro-Raman maps of cross-sections from a 16th century painting

摘要

Spectroscopic imaging is well suited to the study of micro-samples from artworks,where the sample material is limited and the maximum amount of information needs to be obtained.In this study,a new approach to imaging elemental data from energy dispersive X-ray analysis maps was used in conjunction with micro-Raman spectroscopic imaging to characterise the paint layers within micro-samples.Cross-sections from the 16th century painting Portrait of a Youth were found to contain vermilion,lead-tin yellow type 1 and a blue-green pigment consistent with terre-verte.The mid-preparatory layer(imprimatura)contains a high proportion of elements and mineral inclusions that indicates a clay-type composition.The ground layer was identified as anhydrite with large gypsum inclusions.The pigments and composition of the preparatory layers are consistent with those used by Italian Renaissance artist Dosso Dossi.