Method for providing a substrate with a tint and a functional coloring

A method for providing a substrate with a tint and a functional coloring, comprising the following steps (a) to (c) in this order:

• (a) providing a substrate to be provided with a tint and a functional coloring, the substrate being made of plastic glass and the substrate having a first main side and a second main side with a convex shape opposite the first main side,
• (b) applying a tint to both main sides of the substrate provided in step (a), wherein the application of the tint in step (b) is carried out by immersing the substrate in a dyeing tank containing at least one non-functional dye dissolved or dispersed in a liquid medium, and
• (c) applying a functional coloring to both main sides of the substrate provided with a tint on both main sides in step (b) by dip coating, wherein the functional coloring is caused by at least one photochromic dye, and the substrate provided with a tint on both main sides is immersed in a photoresist containing the at least one photochromic dye, whereby the photoresist forms a polymeric layer on the substrate and a substrate provided with a tint and a functional coloring on both main sides is obtained, wherein the polymeric layer having the functional coloring is not removed from both main sides of the substrate.