Process for the manufacture of colourants

摘要

The present invention provides a colourant for inkjet inks which is free from mechanical selectivity, high in light-durability, high in reliability and low in cost. <??>By paying attention to the chemical properties of colouring matter substances and utilizing the technical rules accumulated in the past faithfully to the properties of the colouring matter substances, an epoch-making process for producing fine-particulate colourants by a method comprising five simple steps is provided.