Physical state at 20 °C | Solid | Odour | Odorless |
Melting point/ Freezing point [°C] | 72 – 75°C | Solubility in water [% weight] | Slightly soluble in water |
Colour | Black-green powder | pH value | ~ 6.8 |
Appearance | Black-green powder |
Dye content | Min 85% |
Absorption maxima (in acidified water) | 593 – 603 nm |
Loss on drying (at 105°C) | Max 10% |