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Uncoated Paper - Paper that has not been coated with clay.

Undercolor Addition (UCA) - A technique used to add cyan, magenta and yellow printing dots in dark neutral areas of the reproduction to give them more density.

Undercolor Removal (UCR) - The technique of reducing the cyan, magenta and yellow content in neutral areas of the reproduction and replacing them with black ink so the reproduction will appear normal but will use less ink.

Unit - One inking, plate and impression station on a press. A four-color press has four units.

Up - In printing, two-up, three-up, etc., refers to imposition of material to be printed on a larger size sheet to take advantage of full press capacity.

UV Coating - Liquid applied to a printed sheet, then bonded and cured with ultraviolet light.