A bone folder or bonefolder is a dull edged handtool used to fold and crease material in crafts such as bookbinding, cardmaking, origami and other papercrafts where a sharp crease or fold is needed.
Often made from the leg bone of a cow, deer, or similar animal, there are also synthetic alternatives made from plastics. However those made from bone may be less prone to leaving residues on the workpiece. In Japanese bookbinding the equivalent folding tool is traditionally made from bamboo, although a Japanese fabric marking tool ("hera") or Western bone folder may be substituted.
The bone folder is also used for marking fabric where a temporary mark needs to be made without damaging the material.
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