Disclosed is a colorant composition of the formula
##STR1##
wherein R is an alkyl group, an aryl group, an arylalkyl group, or an
alkylaryl group, and wherein R can be joined to the phenyl moiety to form
a ring, R' is an aromatic- or heteroaromatic-containing group, each
R.sub.a, independently of the others, is a halogen atom, an alkyl group,
an alkoxy group, a nitrile group, a nitro group, an amide group, or a
sulfonamide group, w is an integer of 0, 1, 2, 3, or 4, n is an integer
representing the number of carbon atoms in each repeat alkylene oxide
unit, and x is an integer representing the number of repeat alkylene oxide
units, wherein said colorant has no more than one --OH, --SH, or primary
or secondary amino group per molecule.
