Disclosed is a colorant compound of the formula ##STR00001## wherein Y is a hydrogen atom or a bromine atom, n is an integer of 0, 1, 2, 3, or 4, R.sub.1 is an alkylene group, an arylene group, an arylalkylene group, or an alkylarylene group, provided that no oxygen atom creates a ##STR00002## linkage, X is --O-- or --NR.sub.3-- wherein R.sub.3 is a hydrogen atom, an alkyl group, an aryl group, an arylalkyl group, or an alkylaryl group, and R.sub.2 is a hydrogen atom, an alkyl group, an aryl group, an arylalkyl group, or an alkylaryl group.