Table 4.
Color fastness of poplar veneers dyed with Acid Red GR and chitosan-based biopolymer dye.
| Color Parameter 1 | Water-Fastness | Light-Fastness | ||
|---|---|---|---|---|
| Dye | Chitosan-Based Biopolymer Dye | Dye | Chitosan-Based Biopolymer Dye | |
| ΔL* | 5.36 ± 0.34 | 2.10 ± 0.79 | −8.45 ± 1.17 | −1.98 ± 0.40 |
| Δa* | −12.53 ± 0.35 | −8.38 ± 0.19 | −10.20 ± 0.40 | −3.62 ± 0.09 |
| Δb* | −3.03 ± 0.24 | −5.44 ± 0.45 | −0.14 ± 1.08 | 6.15 ± 0.74 |
| ΔE* 2 | 13.96 ± 0.40 | 10.23 ± 0.42 | 13.29 ± 0.99 | 7.43 ± 0.63 |
1 The color parameter was calculated using Equations (2)–(4); 2 ΔE* was calculated with Equation (5).