Fig. 10: Leonardo Da Vinci, Compositional Sketches for the Virgin Adoring the Christ Child. | npj Heritage Science

Fig. 10: 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

Fig. 10

Left: Raman spectrum acquired in the red pigment particles of the paper preparation, identified as red lead. Weak peaks at ca. 961 and 1086 cm−1 are due, respectively, to bone ash and CO3Ca particles present in the preparatory layer on the paper substrate. λ0 = 785 nm. Right: Raking light photomicrograph showing red lead particles coloring the bone ash preparation. Original magnification: 90×.

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