Physical state at 20 °C | Solid | Odour | Odorless |
Colour | Red brown | Solubility in water [% weight] | Soluble in water |
Appearance | Dark red to brown to black powder |
Absorption maxima λmax1 (0.03 g/L in water) | 513 – 519 nm |
Extinction coefficient at λmax1 | Min 14500 |
Absorption maxima λmax2 (0.03 g/L in water) | 320 – 326 nm |
Extinction coefficient at λmax2 | Min 9000 |
Absorption maxima λmax3 (0.03 g/L in water) | 214 – 220 nm |
Extinction coefficient at λmax3 | Min 33000 |