For electrophotographic printing organic pigments are predominantly used as colorants. Only selected red/magenta pigments are applied for the process color magenta out of hundreds which are commercially available. Besides azo pigments quinacridones play a key role because of their excellent fastness properties.A newly developed quinacridone toner grade shows improved coloristic as well as electrostatic properties compared to existing standard types.
R. Baur, H.-T. Macholdt, "New Colorant for NIP Applications: Magenta" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP15), 1999, pp 586 - 587, https://doi.org/10.2352/ISSN.2169-4451.1999.15.1.art00052_2