Optical coherence tomography (OCT) was used for non-invasive examination of a well-known, yet complex, painting from the studio of Leonardo da Vinci in combination with routine imaging in various bands of electromagnetic radiation. In contrast with these techniques, OCT provides depth-resolved information. Three post-processing modalities were explored: cross-sectional views, maps of scattering from given depths, and their 3D models. Some hidden alterations of the painting owing to past restorations were traced: retouching and overpainting with their positioning within varnish layers as well as indications of a former transfer to canvas.
Keywords: analytical methods; materials science; non-invasive structural imaging; reflectance imaging spectroscopy; stratigraphy.
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.