MSI, MLR and VIL imaging results on detail with Egyptian Blue of fragment of Egyptian coffin (from Archaeological Collections Faculty of Arts, KU Leuven, Belgium)

Detail of a fragment of an Egyptian coffin – Theban, end 22^nd or early 25^th Dynasty (©Archaeological Collections Faculty of Arts, KU Leuven, Belgium): study of reflection, luminescence and surface orientation characteristics of pigments (Egyptian Blue).

a. General representation, multispectral capture with VIS filter (iso100, ss1/125, f9); b. MS-VIL trial capture with 715nm IR Longpass filter (iso100, ss20s, f9), insufficient for luminescence phenomenon of Egyptian blue; c. MS-VIL capture with 830nm IR Longpass filter (iso100, ss20s, f9), clear luminescence phenomenon of Egyptian Blue; d. MS PLD false colour capture (combining the IR, Red and Green datasets) without filters (exposure 150ms, f11), Egyptian Blue turns purple, black pigments are differentiated from the reds, e. MS PLD capture with 830nm IR Longpass filter (exposure 850ms, f8) and with an excitation source wavelength in the Red: 623nm, almost exclusive and very strong luminescence phenomenon of Egyptian Blue; f. MS PLD capture with 830nm IR Longpass filter (exposure 850ms, f8) and with an excitation source wavelength in the Green: 523nm, a weaker luminescence phenomenon of Egyptian Blue; g. MS PLD capture (exposure 150ms, f11): normal map based on PS algorithms with 623nm excitation source, estimation of all surface orientations; h. MS PLD capture with 830nm IR Longpass filter (exposure 850ms, f8): normal map based on PS algorithms with 623nm excitation source, almost exclusive estimation of Egyptian blue surface orientations only.