Multilayered label comprising
a) a base layer made of plastic containing
b) an additive which exhibits a color change under light radiation, in particular laser irradiation, and which
c) is coated on one side with a self-adhesive composition which
d) is, if desired, covered by a release paper or a release film, where
e) the base layer is covered on the other side by one or more protective films arranged one on top of the other which
f) are transparent, permeable to laser irradiation and are provided with a self-adhesive coating.