| Appearance |
Dark brown to purple crystalline powder |
| Identity (IR) |
Conforms to structure |
| Absorptivity maxima ?max 1 (0.005 g/l in water) |
628 to 634 nm |
| Extinction coefficient at ?max 1 |
Min 44000 |
| Absorption maxima ?max 2 (0.005 g/l in water) |
588 to 594 nm |
| Extinction coefficient at ?max 2 |
Min 36000 |
| Absorption maxima ?max 3 (0.005 g/l in water) |
284 to 290 nm |
| Extinction coefficient at ?max 3 |
Min. 28000 |
| Absorption maxima ?max 4 (0.005 g/l in water) |
242 to 248 nm |
| Extinction coefficient at ?max 4 |
Min 16000 |
| Dye content |
Min 90.0% |
