I am lucky some come unstuck okay, but others will not budge, especially those instamatic kodak photos, with layerd backings, and newspaper prints stuck down. Some I think will just have to stay put, but those that can be moved for better preservation, here is a youtube of how to.
They told me they have a pen that can test the paper if it is acid free, depending on the colour the ink turns when testing an inconspicuous part of the album.
Then I asked about photos that are truly stuck in them old sticky albums and they have a product called "Un du".....when I get it, I will let you know how it works okay or not.
The acid testing pen, I am finding which albums are acid free, and those that are not, so I can confidently put photos in the albums that are acid neutral, taking out older photos and replacing them in a newer album. It doesn't have the same feel about it, when looking at the photos, I was so used to old tattered albums with yellowing edges