Nick, are you loading/unloading the Kodak IR film in complete darkness? Also some plastic development tanks are thought not to be IR safe. However I've used Paterson plastic tanks for many years with IR film without fogging.(posted 8447 days ago)Ilford make an extended red/IR film called SFX200 but to obtain true IR effects you must use a true IR filter like Heliopan's 695, 780, 830 (Kodak Wratten equiv. of the 89B, 87, 87C). This film is available in 35mm and 120 format which I have used to good effect. It's easier to handle then the Kodak film (can be loaded in subdued light), and is sharper with finer grain. I hope this is of some help, regards,