| CAS No. | : | 518-47-8 |
| Synonym | : | Fluorescein disodium salt |
| Appearance | : | Orange-red to dark brown powder |
| Identity (IR) | : | Conforms to structure |
| Absorption maxima (in buffer pH 8.0) | : | 488 to 491 nm |
| UV absorbance ratio (P+/-15) | : | 1.2 – 1.7 |
| Specific absorptivity 1%/1cm (at λmax; buffer pH 8.0) | : | Min 1700 |
