| abstract |
The present invention relates to a trisazo compound represented by the following formula (1) or a salt thereof, n The formula (1) n n n n n n n n n n (wherein, the group A is a substituted phenyl group, the group B and the group C are substituted para-phenylene groups, R 1 represents a C1 to C4 alkyl group (which may be substituted by a carboxy group), a phenyl group (which may be substituted by a sulfo group), or a carboxy group,n nR 2 represents a cyano group, a carbamoyl group or a carboxy group, each of R 3 and R 4 independently represents a hydrogen atom, a methyl group, a chlorine atom or a sulfo group, respectively) and a water-based black ink composition containing said compound; said compound has high solubility in a medium where the main component is water, its aqueous solution having a high concentration and ink are stable when stored for a long period of time, black-recorded images with it can be provided where both light fastness and ozone gas fastness of the printed images are excellent. |