Parchment diplomas are often cockled or torn. They can be cleaned, flattened, mended, and mounted for proper storage or framing.
Old paper items are often acidic or have been mended with tape that is deteriorating. They may need deacidification and tape removal.
Old letters have often been opened and folded again and again leaving them weak at the folds. I can mend the paper with archival materials then encapsulate in polyester film for protection