Detail of the chest of an ancient Egyptian statuette showing different color inlays: yellow, pink, and white-gray. PIXE analysis identified four different gold alloys: pure gold, electrum (gold and silver in equal proportions), gold with 25 wt% Cu, and gold with 34 wt% Cu and 6 wt% Ag. Karomama, Egyptian, Twenty-Second Dynasty, first quarter of the 1st millennium BCE, H. 59.5 cm (Musée du Louvre, inv. N500). See Delange, Elisabeth, Marie-Emmanuelle Meyohas, and Marc Aucouturier. 2005. “The Statue of Karomama, a Testimony of the Skill of Egyptian Metallurgists in Polychrome Bronze Statuary.” CULHER Journal of Cultural Heritage 6 (2): 99–113..