Figure 6

Map of the elastic storage modulus of the sample from the Portrait of Silvester van Tongeren by Jan Baptiste Weenix (Rijksmuseum) embedded in resin: (a) microscope observation of the cross-section (Courtesy Rijksmuseum) - this integral surface was indented using a 20 ÎĽm over 30 ÎĽm pitch grid -, (b) mapping gathering all the results of the depth-controlled nanoindentation measurements, (c) average mapping for three measurements.