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| Items | Standard |
| Strength (Percent of the standard) | 100 |
| Shade (As the standard) | Approximate |
| Moisture(%)≤ | 5.0 |
| Insoluble matter in sodium sulfide(%)≤ | 1.5 |
| Particle size (Residue content after filtrated by 250μm sifter) % ≤ |
5.0 |
| Harmful aromatic amines (mg/kg) | Up to standard of GB 19601 |
| Heavy metal element (mg/kg) | Up to standard of GB 20814 |
Appearance: Purple-brown powder
Product character: As the much redder tone of red brown, it usually used to produce coffee or dark brown color by combined with other colors, and mostly used in dyeing corduroy and other textiles.