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Direct Blue 71

3-Aminonaphthalene-1,5-disulfonic acid diazo, andNaphthalen-1-amine first coupling, its product to diazo, and 8-Aminonaphthalene-2-sulfonic acid second coupling, again diazo, in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid third coupling.

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