| Chemistry name: | 1-naphthylamine-5-sulfonic acid |
| Chemistry structure: |
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| Properties: | |
| White or pink needles, gives greenish fluorescence in dilute aqueous solution. | |
| Derivation: | |
| From naphthalene-α-sulfonic acid by nitration, reduction with iron, and separation from the 1-naphthylamine-8-sulfonic acid also formed. | |
| Use: | |
| Azo dye intermediae. | |