Complaint
| Item | Photographic grade | Industrial grade | Anhydrous grade |
| Appearance | colorless transparent crystal | colorless transparent crystal | white powder |
| Assay | ≥ 99.00% | ≥ 98.5% | ≥ 97.0% |
| Water Insoluble matter | ≤ 0.01% | ≤ 0.03% | ≤ 0.03% |
| Sulfide | ≤ 0.001% | ≤ 0.003% | ≤ 0.001% |
| Fe | ≤ 0.001% | ≤ 0.003% | ≤ 0.005% |
| PH | 6.5~9.5 | 6.5~9.5 | 6.5~9.5 |
| Water solution reaction | in accordance with the test | in accordance with the test | ---- |
| Granularity(g/g) | 12~16 | --- | ---- |
