| Chemical Name | disodium salt; 4-Hydroxy-3,4?-azodi-1-naphthalenesulphonic acid, disodium salt |
| C.I. No. | 14720 |
| CAS No. | 3567-69-9 |
| Structure |  |
| Specification | Molecular Formula : C20-H14-N2-O7-S2.2Na Molecular Weight : 502.44 Shade : Rubine & Bluish Red |
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