Table 1. Changes in color parameters of bamboo outer surfaces after 72 hours of artificial UVA radiation
| Radiation time (h) | Average of parameter | Hot-air dried (SD) | Heat treated (SD) |
| Uncoated | Coated | Uncoated | Coated |
| 0 | L * | 57.95 (1.34) | 59.39 (0.22) | 27.78 (0.41) | 27.17 (0.28) |
| a * | –1.20 (0.82) | –1.95 (0.25) | 4.48 (0.89) | 3.74 (0.18) |
| b * | 19.60 (1.19) | 19.74 (0.58) | 3.04 (0.62) | 2.00 (0.12) |
| 72 | L * | 58.03 (0.64) | 59.94 (0.65) | 37.36 (2.36) | 35.30 (2.13) |
| a * | 10.43 (1.22) | 7.36 (1.39) | 7.19 (0.66) | 6.48 (0.36) |
| b * | 26.02 (0.70) | 25.39 (1.17) | 10.86 (0.91) | 9.60 (1.30) |
UVA: ultraviolet A.