|
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%
|