Appearance
|
Orange red brown or maroon powder
|
Assay (on anhydrous basis)
|
Min 95%
|
Solubility (in 1N NaOH)
|
50 mg/ml
|
Molar absorptivity E(490+/-2nm)
|
Min 70000
|
Molar absorptivity E(284+/-2nm)
|
Min 12000
|
Molar absorptivity E(238+/-2nm)
|
Min 39000
|
Loss on drying (at 105°C)
|
Max 5.0%
|
Melting point
|
About 315 °C
|