| Result | Limits | |
| Insoluble Matter: | <0.001% | 0.005% max. |
| Specific Gravity at 25°C: | 1.43 | 1.43-1.44 |
| Assay (as MnCl2): | 40.0% | 40-42% |
| Substances not precipitated by Ammonium Sulfide: | <0.01% | 0.2% max. |
| Heavy Metals (as Pb): | 0.0001% | 0.001% max. |
| Arsenic: | <0.0001% | 0.0003% max. |
| Iron: | 0.0008% | 0.001% max. |
| Zinc: | 0.0001% | 0.005% max. |
| Cobalt: | 0.0001% | 0.002% max. |
| Nickel: | <0.0001% | 0.002% max. |
| Copper: | 0.001% | 0.01% max. |
| Magnesium: | 0.001% | 0.005% max. |
| Sulfate: | <0.002% | 0.005% max. |
| pH(5%) soln. at 25°C: | 4.0 | 3.5 - 6.0 |