Evaluating Multiband Reflectance Image Subtraction for the Characterization of Indigo in Romano-Egyptian Funerary Portraits

The Brooklyn Museum (BKM) began acquiring Egyptian antiquities in 1902 and now boasts one of the largest holdings of Egyptian materials in the United States. This renowned collection contains six Romano-Egyptian funerary portraits on panel: Portrait of Demetrios (11.600, AD 95–100), Woman with Earrings (1996.146.9, AD 100–105), Mummy Portrait of a Man (ca. AD 120–130), Noblewoman (ca. AD 150), Boy with a Floral Garland in His Hair (ca. AD 200–230), and Portrait of a Young Person (ca. AD 200–230). Two of these portraits are characterized as tempera paintings with aqueous binding media and four as