A MA-XRF analysis of Portrait of a 39-year-old Woman (Rembrandt Harmensz van Rijn, 1632, Oil on panel, 76.5 x 59 cm, Inventory number: 0047NMK) was carried out at Nivaagaards Malerisamling. The same type of analysis is going to be performed on supposed related painting at the The Metropolitan Museum of Art.