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| Index name | Index | |||
| Excellent grade | First grade | Qualified | ||
| Gallic acid content(dry base)/(%) | ¡Ý | 99.0 | 98.5 | 98.0 |
| Loss on drying/(%) | ¡Ü | 10.0 | 10.0 | 10.0 |
| Ignition residue/(%) | ¡Ü | 0.1 | 0.1 | - |
| Arsenic/(¦Ìg/g) | ¡Ü | 3 | 3 | - |
| Water soluble test | clear | clear | - | |
| Gallotannic acid test | clear | clear | - | |
| Sulphate(S062-)(%) | ¡Ü | 0.01 | 0.02 | - |
| Chloride(CL-)/(%) | ¡Ü | 0.01 | 0.02 | - |
| Chroma | ¡Ü | 180 | 250 | - |
| Turbidity(NTU) | ¡Ü | 10 | ||
food grade:
| Index name | Index | |
| Gallic acid content(dry base)/(%) | ¡Ý | 99.5 |
| Loss on drying/(%) | ¡Ü | 10.0 |
| Ignition residue/(%) | ¡Ü | 0.05 |
| Water soluble test | clear | |
| Gallotannic acid test | clear | |
| Sulphate(S062-)(%) | ¡Ü | 0.005 |
| Chloride(CL-)/(%) | ¡Ü | 0.001 |
| Chroma | ¡Ü | 120 |
| Turbidity(NTU) | ¡Ü | 5 |
| Iron/(¦Ìg/g) | ¡Ü | 5 |
gallic acid