Good Morning,
I agree with the posts above. Obviously, some experimentation may be very necessary. I'd make one additional point here. I have a somewhat casual interest in philately and collect both mint and used U. S. stamps. In the last few years, the USPS has issued more and more stamps which refuse to soak off paper, making it somewhat frustrating to maintain a used collection. Collectors have, of course, experimented with various chemicals and techniques to solve the problem, including the above-cited alcohol and naptha, sometimes with success, sometimes without. Some adhesives are a lot easier to deal with than others. Some stamps refuse to yield to anything; the envelope paper they're stuck on just has to be closely trimmed and the specimens collected on-paper; I hope that your efforts with the photos and tape will yield a more satisfactory result.
Konical