trimmed out turn-ins

The operation of tidying up the uneven edges of turn-ins on the inside of the boards or cover of a book. On many 16th-century bindings, the stains from the untrimmed turn-ins can be found on the endleaves and/or boards thus revealing exactly how much may have been cut away. The trimming can be done either with a straight or an oblique cut.

For å få innslagene til å se mer ryddige ut, ble de beskåret, ofte slik at innslaget i forkant var litt bredere enn innslagene i hode og fot.