Fig. 11: Leonardo da Vinci, Compositional Sketches for the Virgin Adoring the Christ Child.
From: Materiality and techniques revealed in drawings by Raphael, Leonardo da Vinci, and Perugino
a Visible light image, b False-color infrared image, where iron gall ink appears as red in the areas where it was more heavily applied, and metalpoint shows in black. c Photomicrograph showing the heavy iron gall ink application in the area indicated by the blue arrow in (b). Original magnification: 30×.
