Metal paper clips and staples frequently rust, and the resulting iron oxide invades the paper. Staples weaken the paper. Without staples, people are less likely to fold papers. Curators remove the staples and metal paper clips to prevent further damage. When it is important that materials be fastened together in order to preserve an association among documents that might otherwise be lost, curators use inert plastic clips.
Some items arrive at the repository stored in a highly acidic environment.
Photographs mounted in a scrapbook, paper records covered in construction paper, items reproduced by early duplicating technologies such as thermofax and items stored with clippings from newspapers, exemplify some problems archivists often find. When possible, curators or staff remove the acidic material. Acidic paper not only self destructs at a faster pace than neutral or alkaline paper, it pollutes the neighboring materials with its acids. Staff usually photocopy news clippings onto acid free paper and dispose of the clippings. One can often remove a highly acidic report cover without damaging the unity of the materials within or losing intellectual content.