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Official Journal of the Japan Wood Research Society

Table 4 Statistical comparison of color change values for beech 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 − 0.50 (0.63)gh 0.52 (0.45)ı − 3.72 (1.10)ef 3.89 (1.00)a S1 − 8.91 (1.45)c 1.72 (2.52)j 5.11 (1.41)hı 10.77 (1.40)g
S2 − 10.82 (0.46)a − 7.47 (0.51)a 10.78 (0.91)km 17.02 (0.85)mn
S3 1.13 (0.88)jk − 1.15 (0.68)gh − 3.87 (1.22)ef 4.31 (1.27)a
5 − 0.23 (0.66)ghı 0.00 (0.40)ı − 5.76 (0.97)cd 5.82 (0.96)b S1 − 6.32 (0.87)e 5.14 (0.60)m 4.12 (1.46)hı 9.23 (1.12)ef
S2 − 10.04 (0.56)ab − 5.00 (0.81)c 9.38 (1.28)k 14.66 (1.24)ıj
S3 1.13 (0.70)jk − 1.94 (0.66)efg − 5.05 (0.93)de 5.60 (0.99)b
7 − 0.73 (0.64)fgh − 0.39 (0.54)hı − 7.05 (1.43)c 7.14 (1.43)c S1 − 7.71 (1.21)d 2.73 (1.18)k 0.92 (2.12)g 8.57 (0.99)de
S2 − 9.76 (0.45)b − 5.90 (1.18)b 7.53 (0.94)j 13.73 (0.72)ı
S3 0.09 (0.72)hı − 2.74 (0.56)de − 6.11 (1.07)cd 6.76 (1.00)bc
160 3 − 1.05 (0.65)fg − 1.55 (0.47)fg − 6.08 (1.30)cd 6.43 (1.18)bc S1 − 6.65 (1.84)e 4.86 (1.01)m 4.72 (2.80)hı 9.88 (2.00)fg
S2 − 10.03 (0.67)ab − 4.67 (2.06)c 11.68 (1.74)m 16.19 (2.00)km
S3 0.47 (0.49)ıj − 2.46 (0.40)def − 3.51 (0.98)f 4.36 (0.96)a
5 − 0.54 (0.60)gh − 2.21 (0.52)ef − 6.48 (1.26)cd 6.91 (1.25)bc S1 − 6.89 (0.63)e 4.55 (0.93)m 4.19 (1.28)hı 9.35 (1.07)ef
S2 − 10.13 (0.70)ab − 5.93 (0.99)b 10.38 (2.31)km 15.76 (1.88)jk
S3 1.53 (0.47)k − 2.30 (0.61)ef − 4.96 (1.22)def 5.71 (1.28)b
7 − 1.01 (0.63)fg − 3.33 (0.80)d − 17.65 (1.91)a 18.01 (1.97)n S1 − 6.37 (1.21)e 0.41 (0.52)ı 3.94 (2.33)h 7.66 (2.11)cd
S2 − 9.43 (0.67)bc − 4.83 (0.46)c 5.50 (1.70)ı 12.01 (1.25)h
S3 − 1.43 (0.54)f − 4.63 (1.03)c − 13.22 (0.85)b 14.11 (1.02)ı
  1. Italic numbers indicate the highest and the lowest values of total color change (ΔE*)