Physical state at 20 °C | Solid | Colour | Black powder |
Appearance | Brown to dark green powder |
Dye content (by gravimetric) | Min 85% |
Absorptivity (A 1%/1cm; at λmax; in water) | Min 800 |
Solubility (0.1% in water) | Clear solution |
Absorption maxima in water | 517 – 520 nm |
Loss on drying (at 110°C) | Max 8% |
Suitability (for microscopy) | Passes test |