I chose these particulars corners as they stick on the back of the photo rather than having to fit a photo into a preset corner which can be a bit of a nuisance fitting corners correctly. My concern with squares on the back is would the photo peel off easily as well not affect the photo: I did a trial and the photo peeled away from the square no problem; as for any deterioration of the photo from the adhesive over time - only time will tell - and I’m fine with that for now placing the squares in a non-vital part of the photo. The Squares are much easier to work with - thank you. PS will follow-up in 10 years with an update on any deterioration. Only a three rating as I'm not sure of the long-term adhesive affect but if no concern I would give this product 5 stars