Once refigerated, the film needs to be protected from Condensation. When Bringing a cold camera in, ideal situation is to put it into a small ziplock style bag outside so the condensation does not form on the camera or on the film. (let everything get up to room temperature before opening the bag.) Likwise if you do wnat to refigerate exposed film, keep it in a tightly sealed bag in the fridge and until it reaches room temperature.