(a) RGB image of the Folio 90 verso reconstructed from the 642 nm, 541 nm, and 460 nm bands of the hyperspectral datacube; (b) Spectral Angle Mapper (SAM) classification map obtained with the Spectral Hourglass Wizard routine; (c) endmembers extracted by the Spectral Hourglass Wizard, displayed in ascending order: copper green, indigo blue ink, red lake, gold, cinnabar, black ink, and parchment. Reproduced by permission of Ufficio diocesano per la Cultura e i Beni Culturali, Arcidiocesi di Benevento.