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| Item | index |
| Main content(Na2S2O5) | ≥98 |
| Fe(As content Fe) | ≤0.001 |
| Clarity | Clear |
| Water-Insoluble | ≤0.01 |
| Heavy metal content(Pb) | ≤0.0005 |
| As content(As) | ≤0.0001 |
| PH Value | 4.2~4.8 |