The Centre for Heritage Imaging and Collection Care (CHICC) of the John Rylands Library has experimented recently spectral imaging technologies on some papyri and other manuscripts. You can read a report on the experiment and see some images from here.
Among the pieces processed there are some samples of the carbonised papyri from Thmuis (modern Tell el Timai), which are scattered nowadays in different collections; those in the Rylands Library were purchased on the antiquity market and come from unofficial excavations (see Catalogue of the Greek and Latin Papyri in the John Rylands Library, vol. II, pp. 290-292). These documents are particularly important because of the location of Thmuis in the Delta region, where few papyri were found since the humidity of the area.