There are different types of pressure sensitive tape that have been used to “mend” tears or hinge art to backings and mats. There are no pressure sensitive tapes (despite advertisements) that are safe to be applied to paper. Old pressure sensitive tape adhesive will stain and oxidize (damage) the paper that it has been applied to. It should always be removed as soon as possible. The longer it stays in contact with the paper the more damage it will cause.
In the 1980’s I developed a formula of 5 solvents, for which I coined the term “Kick-a-poo juice”, that efficiently solubilizes the adhesive and using a vacuum suction platen I am able to facilitates the reduction and removal of most of the damaging adhesive residue and staining.
Naturalization papers damaged and “mended” with pressure sensitive tape. The adhesive has migrated into the paper, staining and further damaging the paper.
After tape removal and mending using a process called leafcasting, where tears and losses are filled with toned paper-pulp.
Rare baseball memorabilia, History of Colored Baseball, Sol White.
With strips of pressure-sensitive tape, where the adhesive was staining and oozing around the tape.
After tape removal and stain reduction and having been mended by Leafcasting.
Early American historical document that had been torn and “mended” with pressure-sensitive tape.
After pressure-sensitive tape has been removed and the tears mended with thin Japanese paper on the verso.