Official Journal of the Japan Wood Research Society
Table 2 Statistical comparison of color change values for Scots pine specimens subjected to heat treatment and heat-treated samples after bleaching treatment
From: Determination of color-changing effects of bleaching chemicals on some heat-treated woods
Temp (°C) | Duration (h) | Samples after heat treatment | Solution | Samples bleached after heat treatment | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Mean Δa* | Mean Δb* | Mean ΔL* | Mean ΔE* | Mean Δa* | Mean Δb* | Mean ΔL* | Mean ΔE* | |||
140 | 3 | 4.81 (0.38)ı | 7.54 (0.76)mn | -9.22 (2.62)j | 14.51 (0.93)fg | S1 | 0.61 (0.15)de | 6.01 (0.75)hı | -13.84 (0.54)ef | 15.12 (0.47)g |
S2 | − 0.49 (0.52)b | 0.70 (1.38)ab | − 9.41 (1.08)j | 9.56 (1.04)b | ||||||
S3 | 7.70 (0.30)n | 3.07 (0.47)f | − 14.93 (0.63)d | 17.08 (0.71)ı | ||||||
5 | 3.68 (0.48)g | 7.19 (1.30)jm | − 9.22 (2.62)j | 12.46 (1.82)d | S1 | 0.04 (0.38)c | 5.10 (0.98)gh | − 12.45 (1.22)g | 13.49 (1.32)e | |
S2 | − 0.99 (0.37)a | 0.99 (1.61)b | − 7.77 (0.96)k | 8.03 (1.12)a** | ||||||
S3 | 7.18 (0.49)km | 2.91 (1.00)ef | − 14.00 (0.56)e | 16.03 (0.70)h | ||||||
7 | 4.42 (0.22)h | 7.37 (0.56)jmn | − 10.11 (0.50)ıj | 13.29 (0.45)de | S1 | 0.94 (0.35)e | 5.80 (1.07)hı | − 16.10 (0.64)bc | 17.17 (0.67)ı | |
S2 | − 0.77 (0.35)ab | 1.57 (1.42)bcd | − 9.25 (0.93)j | 9.51 (0.93)b | ||||||
S3 | 7.76 (0.31)n | 3.36 (0.60)f | − 15.02 (0.57)d | 17.23 (0.57)ı | ||||||
160 | 3 | 4.34 (0.37)h | 5.07 (0.89)gh | − 11.59 (0.67)h | 13.39 (0.96)e | S1 | 0.43 (0.29)d | 4.55 (1.01)g | − 13.05 (1.06)fg | 13.85 (1.25)ef |
S2 | − 1.13 (0.28)a | 1.37 (1.16)bc | − 7.91 (0.55)k | 8.18 (0.60)a | ||||||
S3 | 7.05 (0.40)km | 2.43 (0.70)def | − 15.42 (0.95)cd | 17.14 (1.06)ı | ||||||
5 | 6.08 (0.32)j | 6.46 (0.67)ıj | − 16.74 (0.74)b | 18.96 (0.91)j | S1 | 0.67 (0.20)de | 4.50 (0.62)g | − 16.15 (0.80)bc | 16.79 (0.82)hı | |
S2 | − 0.12 (0.35)c | − 0.05 (0.53)a | − 10.90 (0.99)hı | 10.92 (0.99)c | ||||||
S3 | 7.18 (0.88)km | 1.58 (1.46)bcd | − 16.83 (1.13)b | 18.42 (1.36)j | ||||||
7 | 7.01 (0.35)k | 8.20 (0.67)n | − 20.31 (1.04)a | 23.01 (1.06)m | S1 | 1.77 (0.38)f | 5.72 (1.15)hı | − 20.72 (1.01)a | 21.59 (1.17)k | |
S2 | − 1.00 (0.36)a | 1.52 (1.63)bcd | − 7.97 (0.75)k | 8.32 (0.83)a | ||||||
S3 | 7.40 (0.27)mn | 2.04 (0.56)cde | − 20.28 (0.60)a | 21.70 (0.61)k | ||||||