| ITEM | SPECIFICATION |
| Identification A | A violet-red color is produced |
| Identification B | According with IR reference spectrum |
| Loss on drying | Not more than 0.5% of weight |
| Readily carbon substance | Not more color than M.F.Q |
| Residue on ignition | Not more than 0.05% |
| Chloride | No more chloride than Hcl(0.014%) |
| Sulfate | ≤1.25mllead perchlorate (0.02%) |
| Heavy metal | Color is not more intense RS(0.001%) |
| Free salicylic acid | Color is not more intense RS(0.01%) |
| Organic volatile impurities | Meets the requirement |
| Residual solvents | Class 1,2,3.meets the requirement |
| Assay | Contains C9H8O4 99.5%-100.5% |
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