Color developing composition, lithographic printing plate precursor, plate making method for lithographic printing plate, and color developer

A compound represented by Formula 1,

• wherein, in Formula 1, R1 represents a group in which an R1—O bond is cleaved by heat or exposure to infrared rays, R2 and R3 each independently represent a hydrogen atom or an alkyl group, R2 and R3 may be linked to each other to form a ring, Ar1 and Ar2 each independently represent a group forming a benzene ring or a naphthalene ring, Y1 and Y2 each independently represent an oxygen atom, a sulfur atom, —NR0—, or a dialkyl methylene group, R4 and R5 each independently represent an alkyl group, R6 to R9 each independently represent a hydrogen atom or an alkyl group, R0 represents a hydrogen atom, an alkyl group, or an aryl group, and Za represents a counter ion neutralizing a charge,
• wherein R1 is a group represented by any one of Formulae 1-1 to 1-7,
• in Formulae 1-1 to 1-7, ● represents a bonding site with the O atom in Formula 1, R10's each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, —OR14, —NR15R16, or —SR17, R11's each independently represent a hydrogen atom, an alkyl group, or an aryl group, R12 represents an aryl group, —OR14, —NR15R16, —SR17, —C(═O)R18, —OC(═O)R18, or a halogen atom, R13 represents an aryl group, an alkenyl group, an alkoxy group, or an onium group, R14 to R17 each independently represent a hydrogen atom, an alkyl group, or an aryl group, R18's each independently represent an alkyl group, an aryl group, —OR14, —NR15R16, or —SR17, and Z1 represents a counter ion neutralizing a charge, and
• in a case in which R10 in Formula 1-1 is an alkyl group, the alkyl group is an alkyl group having an arylthio group or an alkyloxycarbonyl group at the α-position.