A bone folder, bonefolder, or folding bone is a dull-edged hand tool used to fold and crease material in crafts such as bookbinding, cardmaking, origami, and other paper crafts that require a sharp crease or fold. The tool was also used when correspondence by letter writing was more formal and an art.
They are often made from the leg bone of a cow, deer, or similar animal, or ivory. Alternatives made from plastic now exist; however, those made from bone may be less likely to leave residue on the workpiece.
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- Pickering Rothamel, Susan (2008), The Encyclopedia of Greeting Card Tools & Techniques, New York: Lark Books, p. 42, ISBN 978-1-60059-029-0
- Soonboke Smith (1 August 2004). Origami for the First Time. Sterling Publishing Company, Inc. pp. 14–. ISBN 978-1-4027-1767-3.
- Harrison, Garry; Nadal, Jake. "Repair and Enclosure Treatments Manual". E. Lingle Craig Preservation Laboratory, Indiana University.
- McQueen, Sharon (2005), In-House Bookbinding and Repair, Lanham, Maryland: The Scarecrow Press, p. 17, ISBN 0-8108-5224-1
- Ikegami, Kōjirō (1986), Japanese Bookbinding, Adapted by Stephan, Barbara B., Trumbull, Connecticut: Weatherhill, pp. 12–13, 16, ISBN 0-8348-0196-5