Fig. 7
From: Jan Steen’s ground layers analysed with Principal Component Analysis
a The Merry Family, 1668, oil on canvas. Overview image with cross section location marked with yellow X. b Cross section shown in bright field, layer 1 is the ground layer. c Cross section shown in UV. d Backscatter electron image at ×500 magnification. e–j Elemental mappings of different elements, indicating the presence of earth pigments, lead tin yellow, vermillion and smalt