Abstract: The present invention relates to a method for providing a substrate on one face with a tint and a functional coloration, comprising the following steps (a) to (d): (a) supplying a substrate to be provided on one face with a tint and a functional coloration, the substrate comprising a semifinished part manufactured from transparent plastic and having a first main face and a second main face which lies opposite the first main face and has a convex shape, (b) applying a tint to both main faces of the substrate supplied in step (a), (c) applying a functional coloration to the second main face of the substrate provided with a tint on both main faces in step (b), the functional coloration being brought about by at least one photochromic dye and the at least one photochromic dye being present in a photochromic coat material forming a polymeric coat on the substrate, and (d) post-processing the substrate provided with a functional coloration on the second main face in step (c), in such a way that the tint on the firs