| Appearance | White crystalline powder |
| Identification | Positive reaction |
| Melting point | About 190 ºC |
| Specific rotation | +20.5 — +21.5 º |
| PH value | 2.1 – 2.6 |
| Clarity of solution | Clear |
| Colour of solution | BY7 max |
| Heavy metals | 10 ppm max |
| Copper | 5 ppm max |
| Iron | 2 ppm max |
| Assay(on dried basis) | 99.0 – 100.5% |
| Residue on ignition | 0.1% max |
| Organic volatile impurities | Conforms |
| Oxalic Acid | 0.2% max |
vitamin C
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