How many times have you stumbled across an old box of pictures, letters, or documents only to find them too brittle to handle? If you haven’t yet, believe me, you will and then what do you do?
The basic problem with old documents, especially those stored in low-humidity environments like an attic, is that the paper itself dries out and becomes brittle. Just opening a letter or document can destroy it. Photos, in particular, should never be unfolded or uncurled without some TLC. And by TLC, I mean the use of a humidification chamber.