A litho printing process, printing paper in a reel rather than sheet by sheet. Inks may dry by absorption into the paper, followed by oxidation ('cold set'), or by curing in ovens ('heat set'). Cold set is used primarily for newspapers, because newsprint offers rapid absorption of part of the inf. Glossier papers used for magazines, tourist brochures and catalogues are not so absorbent, and the heat set process gives a high quality of reproduction at high running speeds.