zdenek kucera

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These variously-shaped pieces of bone are used for functions such as smoothing, scoring, & creasing paper & cloth, & working materials into tight corners. The bone folder is polished to a smooth finish to avoid damaging the materials it is used to manipulate, but w/ sufficient (or excessive) pressure its edge is sharp enough to cut paper or cloth. It is best to keep the bone folder clean & free of glue so it slides & burnishes nicely.

Bone Folders - Bookbinding Images and text by Garry Harrison, Head, Circulating Collections Conservation, Indiana University Libraries Preservation Department