摘要：

Disclosed is an azo compound represented by the formula (1) or (2) below, or a saltthereof. (1) (2) (In the formulae, A represents a substitutedphenyl group or a naphthyl group having 1-3 sulfonic acid groups; X represents-N=N- or -NHCO-; R1-R4 independently represent a hydrogenatom, a lower alkyl group or a lower alkoxyl group; m represents a number of 1-3;and n represents 0 or 1.)

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