Elongated tool (approx. 20 cm long; approx. 2 cm wide) usually made of bone, but possibly also horn, wood or ivory with rounded edges. One short side is more pointed than the other.
The folder from boxwood is mainly used for folding sheets coming out of printing (1). The folder made of bone is used by the bookbinder to flatten the corners and edges of the cover of a book and to press the crease in the spine. It is made of bone because this material does not leave a permanent crease mark in the paper or leather.
Uit KIEL, J.: 52; Het aandrukken van een hoek