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The Night Watch by Rembrandt van Rijn with the sample location and paint sample studied with correlated tomography. (A) The Night Watch by Rembrandt van Rijn (1642, Rijksmuseum Amsterdam, 378.4 cm by 453.0 cm) with an indication of the general sample area (white circle). (B) Microphotograph of the area corresponding to sample SK-C-5_003 (white circle) of the exposed quartz-clay ground (C) embedded paint fragment under a light microscope [ultraviolet (UV), 365 nm]. The white dashed rectangle shows the investigated area using correlated tomography. Credit: Science Advances (2023). DOI: 10.1126/sciadv.adj9394