. "A quinacridone compound of formula corresponding to a compound of formula (I) of claim 1 wherein M is an alkali metal, D1, D2, D3 and D4 are fluorine, chlorine or bromine atoms or mixtures thereof, methoxy, methyl groups or mixtures thereof, cyano, dimethylamino, trifluoromethyl, tert-butyl or acetyl groups. 4." . . .