rom about 10 to about 15 percent;and subsequently treating the resulting hydrolyzed pigment hydroxygallium phthalocyanine Type I with a solvent, such as N,N-dimethylformamide, present in an amount of from about 1 volume part to about 50 volume parts and preferably about 15 volume partsfor each weight part of pigment hydroxygallium phthalocyanine that is used by, for example, ball milling the Type