on mixture by admixing (1) the alcohol-substituted colorant, (2) bromine, and (3) a solvent followed by quenching the second reaction mixture with water to form a brominated alcohol-substituted colorant and a salt thereof, of the formulae [0153] wherein Y is a hydrogen atom or a bromine atom and n is an integer of 0, 1, 2, 3, or 4; and (c) forming a third reaction mixture by admixing (1) the bromi