Book Hinging Tape is an acid-free, archival-quality tape used in picture framing to attach a mat to a backing board along a single seam, allowing the mat to open like the cover of a book. This technique ensures that the artwork can be accessed easily without removing the entire framing assembly, while maintaining professional alignment and protection.
Book hinging tape is applied along the top edge of the mat where it meets the backing board. The tape is usually pressed firmly into place with a bone folder or similar tool to ensure proper adhesion. When correctly applied, the mat can swing open smoothly, giving access to the artwork beneath without disturbing the mounting hinges that secure the art itself.
While book hinging tape is typically acid-free, not all tapes are equal in quality. For highly valuable or sensitive works, conservators may prefer traditional hinging methods using mulberry paper and starch paste, which are fully reversible. Pressure-sensitive hinging tapes, even archival ones, may eventually lose adhesion over time. Therefore, the choice between tape and hand-applied paper hinges often depends on the intended longevity of the framing.