four-colour

four-colour noun

1. (modifier) (of a print or photographic process) using the principle in which four colours (magenta, cyan, yellow, and black) are used in combination to produce almost any other colour

Examples from the Web for four-colour Historical Examples of four-colour

Occasionally three and four-colour machines are used, but the one-colour type is probably the most common.

The Jute Industry: From Seed to Finished Cloth

T. Woodhouse and P. Kilgour