Physical state at 20 °C | Solid | Odour | Odorless |
Melting point/ Freezing point [°C] | 320 °C | Colour | Orange red powder |
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 |