My film is coming out blank/white, what’s the reason?

This is usually caused when the film door on the camera or printer has been opened after film has been loaded into the camera or printer.  Instant film is light sensitive, so should only be exposed to light when a picture is taken, not before. If this has happened, you may find that if you keep shooting with that pack of film the first few shots will come out blank but some of the remaining film should come out as normal. This will be as the film further back in the film cartridge did not get fully exposed to light. Obviously this will depend on how long and how intense the light was when the film was exposed.