摘要 |
Poly-azo compound selected from the group consisting compounds of the formula (I) and compounds of the formula (II), (wherein, Me represents copper, nickel, zinc or iron, A represents a naphthyl group having 1 to 3 sulfonic groups and further optionally having an alkyl group or alkoxy group, R<SUP>1 </SUP>and R<SUP>2 </SUP>represent each independently a hydrogen atom, alkyl group or alkoxy group, and R<SUP>3 </SUP>represents an amino group or hydroxyl group.).
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