Verso Left-hand page with even number. Vertical screen Screen in which the cross lines are at 90û and upright rather than at 45û as in the conventional crossline screen. Wash-up The cleaning of the printing units of a press prior to change of ink or shut-down of the machine. Watermark Design impressed into a paper web during manufacture by the dandy roll. Wet strength Tensile strength of saturated paper. Wet-on-wet Superimposition of colours on a multi-unit press (i.e. before each colour has dried). With the grain In the direction of the length of the original web. Paper folds more easily with the grain. Contrast against the grain. Work and tumble Printing the reverse side of a sheet by turning it over on its long axis from gripper to back and using the same plate. Each sheet, cut in half, yields two copies. Work and turn Printing the first side of a sheet, turning the stack across its short axis, and then printing the reverse side of the sheet using the same plate and the same gripper edge. Each sheet, cut in half, yields two copies. WYSIWYG Acronym for 'What you see is what you get' and pronounced 'whizzy wig'. Used to describe page make-up in desktop publishing systems, when what appears on the screen is a direct representation of what would be printed. X-Y co-ordinators Horizontal (x) and vertical (y) alignments used by computers for siting pixels in screen displays or output. Yapp cover Binding material edges which overlap the case boards to provide a 'fringed' effect. Often used on bibles. Zip-a-tone Proprietary name for patterned line or dot effects applied as rub-down film onto artwork. Zoom In analogy with photographic lens, to make what appears in a screen window (in a graphical user interface) larger (zoom in) so that a smaller area is seen, or smaller (zoom out), so that a larger area is seen.

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