Wash Up - To clean ink and fountain solutions from rollers, fountains, screens, and other press components.

Waste - Unusable paper or paper damage during normal makeready, printing or binding operations, as compared to spoilage.

Watermark - Translucent logo in paper created during manufacturing by slight embossing from a dandy roll while paper is still approximately 90 percent water.

Web Break - Split of the paper as it travels through a web press, causing operators to rethread the press.

Web Gain - Unacceptable stretching of paper as it passes through the press.

Web Press - Press that prints from rolls of paper, usually cutting it into sheets after printing. Also called reel-fed press. Web presses come in many sizes, the most common being mini, half, three quarter (also called 8-pages) and full (also called 16-pages).

Wet Trap - To print ink or varnish over wet ink, as compared to dry trap.

Window - (1) In a printed product, a die-cut hole revealing an image on the sheet behind it. (2) On a mechanical, an area that has been marked for placement of a piece of artwork.

Wire Side - Side of the paper that rests against The Fourdrinier wire during papermaking, as compared to felt side.

With the Grain - Parallel to the grain direction of the paper being used, as compared to against the grain. See also Grain Direction.

Woodfree Paper - Made with chemical pulp only. Paper usually classified as calendered or supercalendered.

Working Film - Intermediate film that will be copied to make final film after all corrections are made. Also called buildups.

Wove - Paper manufactured without visible wire marks, usually a fine textured paper.

Wrong Reading - An image that is backwards when compared to the original. Also called flopped and reverse reading.