a quality control device to measure the density of printing ink

the degree of color or darkness of an image or photograph

metal rule or imaged block used to cut or place an image on paper in the finishing process

document

printing on both the front and back side of a sheet

3 or 5 holes drilled on the binding edge of a sheet of paper, created by drilling though the paper; standard hole diameter is 5/16 inch

Drop fold is a set of multiple pages that fold together as a booklet, and are then dropped into a machine that does a right angle fold, commonly for mailing.

double sided

a halftone picture made up of two printed colors