| Parameter | Irradiation dose (kGy) | ||||
|---|---|---|---|---|---|
| 0 | 2 | 4.5 | 7 | 10 | |
| CIE L* | 58.46±1.23 | 60.36±1.10 | 57.34±1.17 | 60.26±1.29 | 57.00±0.28 |
| CIE a* | 3.44±0.25 | 2.90±0.49 | 4.13±0.31 | 4.50±0.75 | 4.46±0.33 |
| CIE b* | 14.43±0.21 | 13.72±0.34 | 13.27±0.66 | 12.94±0.82 | 13.43±0.53 |