[chriscrawfordphoto]

Thank you for the information about the archival corners, Christopher, but I am really amazed to hear (by imputation!) that in this day and age there is no adhesive known to mankind that is truly archival. There HAS to be. That is why I placed this question on the forum. Perhaps there is someone who can answer this seemingly simply question more fully than I can. - David Lyga.

There are archival adhesives and archival tapes, but current practice in museums and other archives is to avoid all adhesives because if you need to ever remount a print (as happens if the mount board is damaged by dropping it or water from a roof leak, etc) then adhesives become a problem. Some are reversible, but none are totally removable...the paper is always affected by any chemical touching it.