| abstract |
This present invention is related to an aqueous solution capable of providing stable ink with inhibition of bronze luster especially, which has good hue as black ink, does not have image quality unevenness of record due to using different record papers, can obtain colored image or color material with excellent fastness, and the change of physical properties is few even if in long-term storage; and an ink composition. Further, it also provides an ink for print such as ink jet, or for note, as well as provides a method for forming image wherein the quality of formed image is not decreased, namely a method for the improvement of image quality decrease. An aqueous solution comprises (a) a preservative, (b) at least one of an azo compound represented by following formula (1) or salt thereof, wherein the content of (b) is 1 mass% to 25mass%. (in formula (1), G represents nitrogen atom or -C(R2)=; R2 represents a hydrogen atom, sulfo, carboxy, substituted or unsubstituted carbamoyl, or cyano; X1, X2, X3, X4, X5, X6 and X7 represent each independently a hydrogen atom, or a substituent of one valence; Y2, Y3 and Y4 represent each independently a hydrogen atom, or a substituent of one valence; Y2, Y3 and Y4 may also combine together with each other to form a ring; Y2, Y3 and Y4 do not represent hydrogen atom simultaneously; M represents each independently a hydrogen atom, or a counter cation of one valence. |