| ITEM | STANDARD | RESULTS |
| Appearance | White,yellowish-white or pinkish-white crystalline powder or crystals | Meets |
| Identification | A.The infrared absorption spectrum; B.The thin-layer chromatography; C.The reaction of primary aromatic amines |
Meets Meets Meets |
| Melting point | about 235°C,with decomposition | 234.4~235.3, decomposition |
| Appearance of solution | Not more intensely coloured than Y4,BY4 or GY4 | |
| Acidity | ≤0.2ml | <0.2ml |
| Related substance | Meets(0.5%) | Meets,<0.5% |
| Heavy metals ppm | ≤20ppm | <20ppm |
| Loss on drying | Not more than 0.5% | 0.16% |
| Sulphated ash | Not more than 0.1% | 0.04% |
| Assay | 99.0~101.0%(Dried basis) | 99.9%(Dried basis) |
| Conclusion | Meets EP7 specifications | |
