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Contact Supplier| Appearance | Bluish to dark violet shiny crystals |
| Assay | Min 97% |
| Chloride (Cl) | Max 0.01% |
| Sulphate (SO4) | Max 0.05% |
| Iron (Fe) | Max 0.05% |
| Copper (Cu) | Max 0.005% |
| Ammonium (NH4) | Max 0.01% |