I work for 3M (different division than this) and dropped a note just now to the area that produces this. I asked what the company statement is regarding the archival nature of the photo adhesive. I'll let you know what I find out. I've never used it for photos but have used it many times for producing foam core board displays of printed materials for visiting exec tours at work, etc. It works very nicely for that duty as it doesn't saturate standard paper or seem to interact with inks, etc.