A paper fold in which both sides are folded across the middle of the sheet in overlapping layers.

Placing the sections of a book in the correct order for binding.

An image which appears as a lighter area on a subsequent print due to local blanket depressions from previous image areas.

Gloss refers to the reflectivity of paper or of the printed matter on it.

The smooth transition from one tone or colour to another, or the range of values between black and white.

The pattern of fibres in a manufactured sheet of paper - most papers are long grain ie the grain runs along the long edge of the sheet. Paper fold more easily and with less cracking when the grain is parallel to the fold

On printing presses these are fingers that keep the sheet in place and carry it during the impression.

The edge, which is caught by the grippers as a sheet of paper is fed into a press.

Unit of measurement used to measure paper weight (and so thickness) in printing.

A machine used to cut or trim a large number of sheets of paper accurately.