Physical state at 20 °C | Solid | Colour | Red powder |
Melting point/ Freezing point [°C] | 430 °C | Solubility in water [% weight] | Sparingly soluble in water |
Initial boiling point [°C] | 287°C | Final boiling point [°C] | 289°C |
Appearance | Red powder |
Absorption maxima in 0.1 N NaOH | 592 – 599 nm |