Color-forming composition, color-forming curable composition, lithographic printing plate precursor and plate making method, and color-forming compound

A compound represented by the following formula (4) or (5) shown below:

• wherein, in the formulae (4) and (5), R1 represents a structure represented by the following formula (2) or (3), R21, R22, R23 and R26 each independently represents a hydrogen atom, R24 represents a hydrogen atom or a chlorine atom, R25 represents a hydrogen atom or a phenyl group, X represents a dialkylmethylene group, O, NR27 or S, and R27 represents a hydrogen atom, an alkyl group or an aryl group;
• wherein, in the formulae (2) and (3), R2, R3, R5, R6, R7, R8, R10 and R11 each independently represents a hydrogen atom or an alkyl group, or R5 and R6, R7 and R8 or R6 and R7 may be connected with each other to form a condensed ring structure, R4 and R9 each independently represents NR18R19, R18 and R19 each independently represents a hydrogen atom, an alkyl group or an alkylsulfonyl group, and R12, R13 and R14 each independently represents a phenyl group having a dialkylamino group in its 4-position.