Appearance |
Dark brown to purple crystalline powder |
Identity (IR) |
Conforms to structure |
Absorption maxima λmax1 (0.005 g/L in water) |
628 to 634 nm |
Extinction coefficient at λmax1 |
Min 44000 |
Absorption maxima λmax2 (0.005 g/L in water) |
588 to 594 nm |
Extinction coefficient at λmax2 |
Min 36000 |
Absorption maxima λmax3 (0.005 g/L in water) |
284 to 290 nm |
Extinction coefficient at λmax3 |
Min 28000 |
Absorption maxima λmax4 (0.005 g/L in water) |
242 to 248 nm |
Extinction coefficient at λmax4 |
Min 16000 |
Dye content |
Min 90.0% |