Book Repair, Restoration and Conservation: Minimum Intervention
Domain 4 tests conservation ethics together with practical repair technique: what to do, and just as importantly what not to do, to a damaged book.
Ethics first
- Minimal intervention – do only what the book needs.
- Reversibility – every adhesive and repair must be removable without loss.
- Documentation – photograph and record condition before and after.
- Originality – retain the original covering, boards, endbands and spine piece.
Technique
- Torn paper: Japanese tissue (kozo, 6–12 gsm), toned to match, laid on a light table with wheat starch paste and dried under weight between Reemay and blotter.
- Detached board: lift the pastedown, bridge the hinge with a tissue strip, press, re-paste the pastedown.
- Split spine: reback with matching cloth over a hollow tube, keeping the original spine strip.
- Enclosure: phase box in acid-free board with linen tape ties.
- Environment: 18–22 °C, 45–55 % relative humidity, filtered light below 50 lux for sensitive paper, routine pest checks.
Worked example
A 1950s book hangs on its threads. Cellotape will stain and cannot be removed; a full reback would destroy the original spine. Do a hinge repair: lift the pastedown, insert a starch-pasted Japanese tissue strip across the hinge, press, and re-paste. Add a hollow-tube reback only if the spine cloth is already split.
Traps
- Self-adhesive tape on any aged paper.
- Trimming a damaged edge instead of repairing it.
- Storing books in acidic cardboard boxes.
- Paste mixed too wet, giving tidelines and cockling.
- Over-cleaning, which removes original surface and print.