I have several questions about long-term frozen storage of B&W film and B&W enlarger paper: 1- Is there an upper limit regarding how long film and paper can be stored? 2- Is there any deterioration with time in frozen storage? If so, what happens? 3- Is there any difference with storage properties of sheet 4x5 and 120 roll film? 4- Are there any special instructions and precautions for storage in a freezer? 5- Can previously opened containers of film and paper be safely stored in a freezer? Any special precautions for doing so? Thanks in advance for your help.