Colored composition

A polymer having a monomer unit obtained by polymerizing a compound represented by the following general formula (I):

• wherein, R1 to R4 each independently represent a hydrogen atom, an alkyl group having 1 to 30 carbon atoms, a hydroxyalkyl group having 1 to 6 carbon atoms, a sulfoalkyl group having 1 to 6 carbon atoms, a carboxyalkyl group having 2 to 7 carbon atoms, a cyanoalkyl group having 2 to 7 carbon atoms, an alkoxyalkyl group having 2 to 6 carbon atoms, a halogenoalkyl group having 1 to 6 carbon atoms, a phenyl group or a benzyl group having a substituent or no substituent, and R5 to R7 each independently represent a hydrogen atom or a methyl group, and A1 represents an alkylene group having 1 to 21 carbon atoms which has at least one group of —O—, —OCO—, —COO— and an arylene group in a chain, and, also has a hydroxy group as a substituent, an alkylene group having 1 to 21 carbon atoms which has at least one group of —O—, —OCO—, —COO— and an arylene group in a chain, an alkylene group having 1 to 9 carbon atoms, or an alkylene group having 1 to 6 carbon atoms which has a hydroxy group as a substituent, and A2 represents —NH— or —O—, and An−represents an anion represented by the following general formula (XVI):
• wherein R42 to R45 each independently represent a halogenated alkyl group of 1 to 3 carbon atoms, a halogen atom or a nitro group, m1 to m4 each independently represent an integer of 1 to 5, and m1 pieces of R42, m2 pieces of R43, m3 pieces of R44 and m4 pieces of R45 may be same or different.