Novel azo compound, aqueous solution, ink composition, ink for ink jet recording, ink jet recording method, ink cartridge for ink jet recording, and ink jet recorded matter

摘要

The present invention relates to an aqueous solution and an ink composition, which can provide a stable ink which has a good hue as black ink, imparts colored images or colored materials having an excellent fastness, and furthermore, has a small change in physical properties, particularly suppressed bronzing even when preserved over a long period of time. In addition, there is provided a method of forming an image, which provides ink for printing or recording, such as inkjet, and prevents a reduction in image quality of the formed image (a method of preventing a reduction in image quality). An aqueous solution containing (a) a preservative and (b) at least one azo compound represented by the following Formula (1) or a salt thereof, in which the content of (b) is 1% by mass to 25% by mass. (In Formula (1), G represents a nitrogen atom or -C(R 2 )=. R 2 represents a hydrogen atom, a sulfo group, a carboxyl group, a substituted or unsubstituted carbamoyl group or a cyano group. X 1 , X 2 , X 3 , X 4 , X 5 , X 6 and X 7 each independently represents a hydrogen atom or a monovalent substituent. Y 2 , Y 3 and Y 4 each independently represents a hydrogen atom or a monovalent substituent. Y 2 , Y 3 and Y 4 may be bonded with each other to form a ring. All of Y 2 , Y 3 and Y 4 do not represent hydrogen atoms at the same time. M each independently represents a hydrogen atom or a monovalent countercation.)