| Time (h) | MO | MB | ||||
| Absorbance (a.u.) | Wavelength (nm) | Degradation percent (%) | Absorbance (a.u.) | Wavelength (nm) | Degradation percent (%) | |
| 0 | 0.837 | 465 | 0.00 | 0.515 | 662 | 0.00 |
| 1 | 0.765 | 465 | 8.60 | 0.369 | 662 | 28.34 |
| 2 | 0.589 | 461 | 29.62 | 0.104 | <662 | 79.80 |
| 3 | 0.508 | 461 | 39.30 | 0.085 | <662 | 84.27 |
| 4 | 0.239 | 455 | 71.44 | 0.062 | <662 | 87.96 |
| 5 | 0.082 | 446 | 90.20 | 0 | 0 | 100.00 |