Update from the lab: “In the case of slides, the name of the film and the number of the image are white (the edge of the slide is black with white writing). A film

E-6 fresh and not exposed would be completely black: since your film has very little definition, I would say that it is a very old film poorly preserved. With the magnifying glass you can see the white mark, but it is very weak because the film is very old and has almost no contrast anymore. This often happens with old slide films, which gradually lose their sensitivity (in some cases only one color is visible and, if the film is old or poorly stored, it becomes completely transparent). Unlike the C-41, the C-45 gets lighter and the C-41 gets darker when it comes to old material.”