| Assay: | =99.5% C6H8O7 |
| MAXIMUM ALLOWABLE | |
| Insoluble matter: | 0.005% |
| Residue after ignition: | 0.02% |
| Chloride (Cl): | 0.001% |
| Oxalate (C2O4): | Passes test |
| Phosphate (PO4): | 0.001% |
| Sulfate (SO4): | 0.002% |
| Iron (Fe): | 3 ppm |
| Lead (Pb): | 2 ppm |
| Substances carbonizable by hot sulfuric acid: | Passes test |