| Exposure Time (days) | Electrode Potential (mV) | pH of Environment | Concentration of mineral salt medium in mil/litre |
| 0 | −0.550 | 7.0 | 500 |
| 7 | −0.661 | 6.8 | 510 |
| 14 | −0.672 | 5.0 | 520 |
| 21 | −0.710 | 5.0 | 525 |
| 28 | −0.710 | 5.0 | 530 |
| 35 | −0.712 | 4.0 | 530 |
| 42 | −0.710 | 6.0 | 535 |