Hexachrome

The main purpose of Hexachrome was to create a printing ink system that could depict brighter and clearer pictures by being able to produce more accurate colors. Using this system instead of the CMYK ink system prints also allowed for more accurate skin tones and pastels. The Hexachrome system let users print images from computer screens that were not able to be accurately duplicated before. As well as producing overall better quality than previous systems, Hexachrome also increased efficiency as it produced many more spot colors.Having more spot colors increased efficiency by allowing the press to use one ink set for all jobs, rather than one specified ink set for each job. Keeping a printer configured for Hexachrome also eliminated the number of washes required on the printer; therefore saving times and simplifying printing production.
( Source Wikipedia )