ibres that has not previously been used; fibre taken direct from the tree. (See also recycled fibre).

Volatile Organic Compound. In printing VOCs come from chemicals used in the printing process and from some inks; they evaporate into the pressroom and are considered toxic.

The ability in digital printing to change each document in a run to include different text or images, so that each is personalised/individualised (see also personalised printing).

Paper that has been modified by the action of sulphuric acid, to give it a continuous texture, an increased surface hardness and a high degree of resistance to penetration by organic liquids and particularly fats, oils and greases. The structure also confers on the paper resistance to disintegration by water, even at boiling point.

Often used for certificates, vellum paper is strong, tough and of high class appearance. It is made to imitate the fine smooth finish of a parchment made from animal skin.

An expression used to denote the theoretical thickness in millimetres of 100 sheets of the given paper in 100 g/m2. It thus gives an indication of the bulk of the paper.

A spot appearing as an inkless hole in a printed image. See Hickey.