This chapter focuses on the colour used in risoprinting. Topics include the distinctive colour composition, the variety of the risograph’s ink palette and the technique behind colour separations; it also briefly shows how to create colour profiles for the risograph.
The risograph uses an emulsion ink, which consists of a mix of oil and water bases.1 Emulsion (lat. Ex and mulgēre, “milked”) is a process in which two unmixable substances are combined with an emulsifier; this produces a compound of two liquids that would normally not mix without any visible separation. Examples of emulsions include cosmetics, milk, mayonnaise or, as in this case, colour based on soybean oil.2