The invention relates to a transparent thermoplastic material, containing 0.0001 to 2 wt. % of substantially flat metal identification platelets with a largest length elongation of less than 200 μm and a thickness of 2-10 μm, a round or n-angled shape where n≧4, wherein the metal identification platelets do not have any recesses or have recesses that lie substantially in the center of the metal identification platelet, do not come closer than 20 μm to the circumferential outer edge of the metal identification platelet, and do not account for more than 30% of the surface area of the metal identification platelet. The invention also relates to the production thereof and the use for producing films for personalization of a card layer composite and data carriers in card form, especially smart cards, magnetic strip cards, identification cards and the like.