Patent ID: 7632682

Claim:
A colorant comprising: a) a compound having formula (I): wherein A 1 and A 2 are, independently of each other, polyethyleneoxy-, polypropyleneoxy-, or polyethyleneoxy-/polypropyleneoxy-copolymers; wherein the number of repeating polyethyleneoxy-, and/or polypropyleneoxy- units is less than or equal to 25; or wherein A 1 and A 2 are, independently of each other, —CH 2 CH 2 CH 2 M[(CH 2 CH 2 O) x CH 2- CH 2- ] y —; wherein M can be either O or N and x=0-5, and if M is O, then y=1 and if M is N then y=2; and wherein R 1 and R 2 represent the terminal group of the polyalkyleneoxy chain and are, independently of each other, selected from the group consisting of OH, NH 2 , and C 1 -C 8 alkoxy groups; b) an impurity having formula (II): wherein A 1 and R 1 are as defined above in formula (I), and wherein the impurity is present in an amount that is less than about 1.0% by weight; and c) a water and methanol insoluble black impurity, wherein the impurity is present in an amount that is less than about 1.0% by weight.