The Type I hydroxygallium phthalocyanine obtained can be treated by, for example, ball milling the Type I hydroxygallium phthalocyanine pigment in a suitable solvent, for example N,N-dimethylformamide, present in an amount from about of in the presence of spherical glass beads, 1 millimeter to about 7 millimeters in diameter, at room temperature, about 25??? C. or slightly above, for a period of f