Cyan dye mixture, water-based cyan ink composition, and method of ink-jet recording

A cyan dye mixture comprising compounds which are represented by the following formula (1):

• 8
• wherein M represents a proton, alkali metal ion, alkaline earth metal ion, onium ion of an organic amine, or ammonium ion;
• m is an integer of 1 to 4;
• n is an integer of 0 to 3;
• provided that m+n is an integer of 1 to 4, and which have λmax in a 590-630 nm region and no peak in a 640-670 nm region of an absorption curve as spectrophotometrically measured in water with concentrations thereof adjusted to 0.01 g/l.

A cyan dye mixture comprising a mixture of compounds which are represented by the following formula (1):

• 9
• wherein M represents a proton, an alkali metal ion, an alkaline earth metal ion or an onium ion or ammonium ion of an organic amine;
• m is an integer of 1 to 4;
• and n is an integer of 0 to 3;
• provided that m+n is an integer of 1 to 4, and containing a compound which has absorption peaks in a 615-640 nm region and 655-680 nm region of an absorption curve as spectrophotometrically measured in N,N-dimethylformamide with absorbance adjusted from 1 to 2 Abs, and which has a “D-C” value of not more than 48 nm wherein C represents a wavelength of the absorption peak in the 615-640 nm region;
• and D represents a wavelength of the absorption peak in the 655-680 nm region.