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)

<p>Detail of a fragment of an Egyptian coffin &ndash; Theban, end 22^nd or early 25^th Dynasty (&copy;Archaeological Collections Faculty of Arts, KU Leuven, Belgium): study of reflection, luminescence and surface orientation characteristics of pigments (Egyptian Blue).</p> <p><strong>a</strong>. General representation, multispectral capture with VIS filter (iso100, ss1/125, f9); <strong>b</strong>. MS-VIL trial capture with 715nm IR Longpass filter (iso100, ss20s, f9), insufficient for luminescence phenomenon of Egyptian blue; <strong>c</strong>. MS-VIL capture with 830nm IR Longpass filter (iso100, ss20s, f9), clear luminescence phenomenon of Egyptian Blue; <strong>d</strong>. 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, <strong>e</strong>. 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; <strong>f</strong>. 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; <strong>g</strong>. MS PLD capture (exposure 150ms, f11): normal map based on PS algorithms with 623nm excitation source, estimation of all surface orientations; <strong>h</strong>. 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.</p>