A sealing film, comprising a carrier film and a plurality of functional layers comprising at least two color display layers and at least two adhesion-controlling layers, the sealing film having an adhesive layer for fastening to a base surface, the carrier film being at least partially detachable from the functional layers in order to bring the sealing film from a first state into a second state, at least one symbol arrangement being optically visible at least in a remainder in the second state, which at least one symbol arrangement is arranged in a first subregion and a second subregion. According to the invention, the functional layers and the adhesive layer are at least partially translucent and the functional layers comprise at least one additional color display layer and at least one additional adhesion-controlling layer, the functional layers being designed in such a way that the at least one symbol arrangement is optically better visible in the first subregion than in the second subregion on a light background and that the at least one symbol arrangement is optically better visible in the second subregion than in the first subregion on a dark background.