Abstract: An apparatus is provided as an indicator seal for a film cartridge, the cartridge having a cylindrical well for accepting a rewinding shaft of a camera. The seal comprises a disk made of sheet material and having a pair of sides. The disk has an outside diameter for fitting on an end surface of the cartridge, and a circular partial perforation formed in the disk concentrically with the outer diameter. The partial perforation separates the disk into an outer annular part and an inner disk shaped part. The outer part has an adhesive layer on one of the sides of the disk such that the outer part may be adhered to the end surface of the film cartridge. A printed warning is included on the side without the adhesive such that the warning is normally in plain sight when the seal is attached to the cartridge. An additional indicia may be included on the side without the adhesive for indicating recommended action.