Fig. 3From: Colour identification, degradation processes and findings in a fifteenth-century Book of Hours: the case study of Cofre n.º 31 from Mafra National Palaceµ-EDXRF spectra of three different writing inks, assigned to three groups of folios of Cofre n.º 31 and their respective images, showing the relative peaks of Fe, Cu and Zn; characteristic elements of the parchment are also shown (Ca, Fe, K and Mn)Back to article page