In a process for forming a self-dispersing crystalline phthalocyanine pigment
composition of monodisperse nanoparticles, a mixture containing titanyl fluorophthalocyanines,
unsubstituted titanyl phthalocyanine, and an organic monomeric dispersant but substantially
free of organic solvents or inorganic salts is dry milled, thereby forming a substantially
amorphous phthalocyanine pigment composition. The substantially amorphous composition
is contacted with an organic solvent having a hydrogen bonding parameter gammac
lower than about 8, thereby forming a self-dispersing cocrystalline phthalocyanine
pigment composition of monodisperse nanoparticles containing titanyl fluorophthalocyanines
and titanyl phthalocyanine, which can be used to form the charge generation layer
of an electrophotographic element.