| Properties: | |
| Moist, irregular, dark blue or purple granules; slightly pungent odor. | |
| Derivation: | |
| Carbacrylic cation-exchange resin, in reversible combination with 3-amino-7-dimethylaminophenazathionium chloride (azure A dye). | |
| Grade: | |
| NF. | |
| Use: | |
| Medicine (diagnostic test). | |