I recently shot a roll of expired slide film in my mamiya 645 super. I've shot several before this and never had this issue. Upon receiving the slides back from the lab I noticed that running the entire length of the film there is an iridescent green running vertically on both sides. As I said I have never had this happen on the handful of rolls I've used in this camera. I am wondering if this is from a light leak or possibly having the edges exposed to more light than is ok during either loading or unloading or storage. I am unsure if the storage before I purchased it but the other roll that I used came back fine. I also have never noticed any foam light seals which on other forums people believe may be the problem. I'm relatively new to this camera and have not posted anything on this site before. If I knew how to post pictures I would so as to allow y'all to see what I'm referencing. Thanks in advance.