Water based ink composition and image forming method

A water based ink composition comprising at least one of compounds represented by Formula (1)through (11). 39

• wherein R1 represents an alkyl group or an aryl group which may have a substituent, R2 represents a phenyl group which may have a substituent, and R3 represents a phenyl group which may have a substituent, with proviso that, at least one of R1, R2, and R3 is a group represented by General Formulas (2) or (3):
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• in General Formulas (2) and (3), R4 represents a substituent having a water solubilizing group, R5 represents a substituent, and m2 represent 0 to 3, R6 and R7 each represent a substituent having a water solubilizing group, R8 represents a substituent, and m3 represents 0 to 3, 41
• wherein R9 represents a phenyl group which may have a substituent, R10 represents a hydroxyl group, or an amino group, an acylamino group or a carbamoyl group which may have a substituent, and m4 represents 0 to 7, with proviso that, at least one substituent of R9 or R10 is a group represented by General Formula (2) or General Formula (3), or a group R9 or R10 mentioned above which is substituted by the group represented by the General Formula (2) or (3), 42
• wherein R11 and R12 each represent a substituent having a water solubilizing group, R13 and R14 each represent a substituent, n5 and m5 each represent 0 to 4, 43
• wherein R15, R16, R17, R18, and R19 each represent a hydrogen atom or a substituent having a water solubilizing group, with proviso that, at least two of R15, R16, R17, R18, or R19 are substituents having a water solubilizing group, 44
• wherein R20 and R21 each represent a substituent having a water solubilizing group, R22, R23, and R24 each represent a substituent, and m7, l7, and n7 each represent 0 to 4, 45
• wherein R25 and R26 each represent a substituent having a water solubilizing group, R27, and R28 each represent a substituent, and m8 and n8 each represent 0 to 4, 46
• wherein R29 and R30 each represent a substituent having a water solubilizing group, and R31 and R32 each represent a hydrogen atom or a substituent, 47
• wherein R33 represents a substituent having a water solubilizing group, R34 represents a substituent, and m10 represents 0 to 8, while n10 represents 0 to 8, 48
• wherein “A” represents an insoluble pigment residual group, and the group in the parenthesis bonds to the nitrogen atom of “A”, X represents a hydrogen atom or a counter cation, R35 represents a substituent, and l11, represents 0 to 4, and when l11, is 2 to 4, a plurality of R35 may be joined together to form a ring, while “k” represents 1 to 5.