Official Journal of the Japan Wood Research Society
Table 3 Statistical comparison of color change values for fir 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 | 0.20 (0.27)h | 1.93 (0.84)ef | − 6.48 (0.83)hıj | 6.81 (0.88)de | S1 | − 2.25 (0.33)f | 4.62 (1.42)ıjm | − 7.18 (1.17)fgh | 8.99 (0.96)hı |
S2 | − 2.62 (0.33)de | − 3.76 (1.03)a | − 1.70 (1.20)m | 5.09 (0.53)b | ||||||
S3 | 5.45 (0.52)k | 0.79 (0.89)d | − 10.68 (0.85)b | 12.05 (0.94)m | ||||||
5 | 1.73 (0.27)ı | 5.49 (0.55)mnp | − 4.69 (0.72)k | 7.44 (0.83)ef | S1 | − 1.57 (0.29)g | 5.41 (0.99)mnp | − 6.85 (0.88)ghı | 8.92 (0.92)hı | |
S2 | − 2.45 (0.40)ef | − 2.10 (0.96)b | − 1.66 (0.96)m | 3.85 (0.41)a | ||||||
S3 | 7.69 (0.64)p | 2.49 (0.64)fg | − 10.51 (0.92)b | 13.28 (1.12)n | ||||||
7 | 2.70 (0.20)j | 6.90 (0.43)r | − 7.68 (0.63)efg | 10.68 (0.66)j | S1 | − 2.43 (0.24)ef | 3.41 (0.96)h | − 8.41 (0.81)de | 9.45 (0.76)ı | |
S2 | − 3.02 (0.24)bc | − 0.30 (1.10)c | − 4.72 (1.12)k | 5.77 (0.73)bc | ||||||
S3 | 6.83 (0.39)m | 2.23 (0.71)efg | − 12.52 (0.76)a | 14.45 (0.87)p | ||||||
160 | 3 | 0.36 (0.32)h | 1.05 (0.68)d | − 7.67 (0.71)efg | 7.77 (0.80)fg | S1 | − 3.32 (0.25)b | 3.991.08)hıj | − 5.66 (0.90)j | 7.76 (0.74)fg |
S2 | − 4.36 (0.27)a | 1.56 (1.71)de | − 1.63 (0.58)m | 5.17 (0.59)b | ||||||
S3 | 5.40 (0.51)k | 0.67 (0.84)d | − 10.55 (1.08)b | 11.89 (1.22)km | ||||||
5 | 2.80 (0.22)j | 5.69 (0.42)np | − 9.10 (0.71)cd | 11.10 (0.79)jk | S1 | − 1.35 (0.29)g | 5.84 (0.76)p | − 9.36 (0.75)c | 11.13 (0.88)jk | |
S2 | − 2.86 (0.40)cd | 0.90 (1.04)d | − 5.60 (1.70)j | 6.51 (1.38)cd | ||||||
S3 | 7.25 (0.43)n | 3.09 (1.32)gh | − 11.90 (1.16)a | 14.33 (1.30)p | ||||||
7 | 1.65 (0.31)ı | 3.86 (0.44)hı | − 7.30 (0.82)fgh | 8.43 (0.83)gh | S1 | − 2.38 (0.20)ef | 4.86 (0.70)jmn | − 6.18 (0.84)ıj | 8.25 (0.76)fgh | |
S2 | − 2.24 (0.24)f | − 0.59 (0.98)c | − 8.03 (1.17)ef | 8.42 (1.05)gh | ||||||
S3 | 6.87 (0.35)m | 2.32 (1.08)efg | − 10.38 (1.25)b | 12.71 (1.27)mn | ||||||