Fig. 2

Cross sections from the yellow-green lining of the Virgin’s mantle at the bottom edge of the panel. Two samples (A and B) both from the very bottom edge of the panel at the black dot in Fig. 1. A was modified by stack focussing using a plug-in for ImageJ. The scale bars are 25 µm. The layers in A are from the bottom: a gesso ground; b a dark inky wash; c a white wash that is more easily visualized in Fig. 5a; d an uneven layer of blue and green particles, azurite (labeled 1), malachite, mixite (labeled 2); e yellow iron oxide; f lead white; g lead tin yellow. The sample in B, taken adjacent to that in A, is simpler: a a layer of gesso is covered by b paint with a mixtures of lead tin yellow and copper-based green and blue pigments, azurite (1) and mixite (2)