0134] The unbrominated alcohol-substituted colorant can also be converted to an unbrominated ester-substituted colorant by this same process, as follows (illustrated for an embodiment wherein the alcohol-substituted colorant is substituted with the ester group in the 4- or para-position): [0135] wherein Y is a hydrogen atom or a bromine atom, n is an integer of 0, 1, 2, 3, or 4, R1 is an alkylene