| CAS No. | : | 68988-92-1 |
| Synonym | : | Eosin Methylene blue according to Wright |
| Appearance | : | Greenish black crystalline powder |
| Absorption maxima in methanol (λmax1) | : | 640 – 648 nm |
| Absorption maxima in methanol (λmax2) | : | 522 – 525 nm |
| Specific absorptivity 1%/1cm (at λmax 1) | : | Min 1100 |
| Specific absorptivity 1%/1cm (at λmax 2) | : | Min 650 |
| Suitability (for microscopy) | : | Passes test |
| Loss on drying (at 110oC) | : | Max 10% |