Fig. 7From: The practice of writing inside an Egyptian monastic settlement: preliminary material characterisation of the inks used on Coptic manuscripts from the Monastery of Apa Apollo at BawitXRF raw net peak intensities of Fe, Cu and Pb measured in three different regions (1, 2, 3) on each manuscript: P.PalauRib. Inv. 357, Inv. 399, Inv. 401 and Inv. 451v. This graph reports qualitative results only since the cross-section of the interaction between the element and the X-rays grows with the atomic numberBack to article page