Someone gave me a couple of bulk film loaders with mystery film in them. One is labeled "931". I have no idea what this stuff is. It is 35mm film with sprocket holes. The film is a nice Kodak yellow color on the glossy side, with the other side looking more like a whitish tan color. Any clues? I have never seen 35mm film with this appearance. Oh, a clue! There are little tic marks on one edge, on the sprocket line, repeated every four sprocket holes. On the opposite edge is "10 S22992", repeated at intervals of several inches. This is starting to sound like movie film.