Figure 4 | Scientific Reports

Figure 4

From: Imaging and micro-invasive analyses of black stains on the passepartout of Codex Atlanticus Folio 843 by Leonardo da Vinci

Figure 4

FE-SEM images of the accumulation of particles inside an inter-fiber’s cavity in the medium-dark region. Different magnifications are proposed: (a) 1.8 K×, (b) 5 K×, (c) 10 K×, (d) 25 K×. The size of particles varies between 200 and 300 nm. This type of structure was also found in the dark regions, while no detection was possible in the white region.

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