| Appearance |
Red powder |
| Loss on drying (110°C) |
Max.5% |
| Initial Boiling Point |
287°C |
| Melting Point |
430 °C |
| Solubility In Water (% weight) |
Sparingly Soluble in Water |
| Dye content (By Spectrophotometry on dried substance) |
Min 70% |
| Transition range pH 4.3 – 6.3 |
Brilliant yellow to pink |
| Transition range pH 9.4 – 12.0 |
Brown orange to violet |
| Absorptivity (A1%/1cm at 556) |
Min 350.0 |
| Absorptivity (A1%/1cm at 595) |
Min 325.0 |
| Absorption maximum in 0.1N NaOH λmax1 |
553-559nm |
| Absorption maximum 0.1N NaOH λmax2 |
592-599nm |
