I just bought a battery for a camera that I have and it had a partially exposed roll of Tri-X in it. I know the film is expired by 3-4 or more years. Not kept in a fridge or freezer. It's rated at 400 ISO, but I was wondering how I should develop it. I'm sure I can't rate it at 400 anymore, can I? I'm not sure if this is a film or darkroom question. Please feel free to move it if need be. Thanks.