|
Appearance
|
Dark brown to very dark brown or black powder
|
|
Solubility (0.1 % in distilled water)
|
Clear blue solution
|
|
Dye content
|
Min. 85.0%
|
|
Absorption maxima
|
606 - 611nm
|
|
Absorptivity (A 1%/1cm; at λmax; on dried substances)
|
Min. 800.0
|
|
Loss on drying (at 110°C)
|
Max. 10.0%
|
|
Suitability (for microscopy)
|
Passes test
|