| CAS No. | : | 573-58-0 |
| Synonym | : | Direct Red 28 |
| Appearance | : | Brownish red powder |
| Appearance of solution (1.0 g/L; water) | : | Almost clear to slightly turbid, red solution |
| Transition range at pH 3.0 to pH 5.2 | : | Violet to orange red |
| Loss on drying (at 110oC) | : | Max 5.0% |
| Sensitivity test | : | Passes test |