TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The absorbing substance is selected from L-ascorbic acid, isoascorbic acid, L-ascorbate, isoascorbate, ascorbyl palmitate and stearate, tocopherol (alpha-, gamma-, delta-tocopherol), gallate (propyl, octyl, do-decyl), butylhydroxyanisole, butylhydroxytoluene, oxygen depleting copolymer and oxygen scavenger and singlet oxygen quenches.    TECHNOLOGY FOCUS - POLYMERS - Preferred Film: The protective film comprises further layer(s) in any arrangement below, above and between the three layers, one of the barrier or absorber layers may serve as the support, and the barrier layers BL may have the same or different structures. The protective film comprises the structure (AL-BL-)n (where n is greater than 2, preferably 2-6, especially 2 or 3), where one of the barrier or absorber layers may serve as the support. The protective film comprises a support (SU), barrier layer, absorber layer and barrier layer (SU-BL-AL-BL); or SU-BL-AL-BL-AL-BL. The protective film additionally comprises a functional layer (FL) (preferably the functional layer is an UV layer or photochromic layer). Preferred Layer: The barrier layer has a permeability coefficient to the harmful substance of less than 0.1. The absorber layer is composed of a matrix material embedding an oxygen absorbing substance, preferably (i) composed of a matrix material is selected from polyvinyl alcohol and gelatin, and (ii) the absorbing substance. Preferred Components: The barrier layer is composed of low density polyethylene, high density polyethylene, propylene, polystyrene, poly(methyl methacrylate), polyacrylonitrile, polyacrylonitrile (BAREX), polymethacrylonitrile, polyvinyl acetate), polyvinyl alcohol), polyvinyl chloride), poly(vinylidene chloride), poly(vinylidene chloride copolymer, polytetrafluoroethylene, polybutadiene, polydimethylbutadiene, polyoxymethylene, polyester, Mylar A, Hostaphan, poly(ethylene terephthalate, poly(tetramethylene carbonate), polydimethylsiloxane, polyamide and cellulose acetate. Preferred Method: In the method (p1), the layer applied by a continuous casting process is the barrier layer that is remotest from the support; and at least two layers are applied by a continuous casting process in one machine run by using a multiple casting device. EXAMPLE - A photochromic material was prepared as an oxygen-sensitive layer by applying a layer 1 (dry application 10 mu m) at first to a triacetate film having a thickness of 120 mu m (SU) by continuously operating casting machine. The layer 1 (photochromic layer (PL)), comprised of (wt.%): acrylate paint (99.97, 30 wt.% solids) with a solvent mixture of ethyl and butyl acetates of 1:1; and a dye of formula (IA) (0.03). Thus, the dye was dissolved in toluene at a concentration of 30 g/l each. Subsequently, the material was dried at room temperature in air, and then layer 2 (barrier layer BL) comprised of (wt.%): Elvanol T-66 (RTM: polyvinyl alcohol, aqueous solution) (10), was applied at dry application of 10 mu m. The material obtained was again dried at room temperature in air, then layer 3 (absorber layer (AL)) and layer 4 (barrier layer (BL)) was applied at dry application of 10 mu m (where the layer 3 comprised of (wt.%): ascorbic acid (5), and Elvanol T-66 (10); and the layer 4 comprised of (wt.%): Elvanol T-66 (10)). The material obtained was again dried at room temperature in air. The photochromic materials were irradiated with the light of a 100 kLx xenon lamp normalized to daylight, and the % density reduction of the dye in the switched state was measured in terms of relative useful life. The relative useful life of the obtained test layer structure (SU-PL-BL-AL-BL) was arbitrarily set at 5000%, as compared to the layer structure SU-PL and SU-PL-BL (where arbitrarily set at 100 and 500% respectively). Thus it was observed that barrier layer alone also improved the useful life of the photochromic layer, which was not sufficient for critical applications. It was only by the barrier layer stack according to the test that a qualitative stability improvement was achieved that offers sufficient protection even for such critical cases.