Printing with four half-tone images at different screen angles using four different colors. Usually the four colors would have a color slant or cast towards a selected tone or color; for example a sepia-tone or overall brown slant or cast.
In printing, a printing dot that has a percentage that is close to the 25% printing dot size.
Those inks that set-up faster and dry faster, usually from top to bottom. These inks are used when sheets have to be sent back through the press faster than normal drying time will allow.