| Chemistry name: | 2-naphthylamine-5,7-disulfonic acid; 6-amino-1,3-naphthalene-disulfonic acid |
| M Formula: | C10H5(NH)2(SO3H)2 |
| Properties: | |
| Crystallizes in white lustrous leaflets from water and in long needles from hydrochloric acid solution. | |
| Derivation: | |
| By sulfonation of either 2-naphthylamine-5-sulfonic acid or 2-naphthylamine-7-sulfonic acid. | |
| Use: | |
| Azo dye intermediate. | |