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Official Journal of the Japan Wood Research Society

Table 5 Statistical comparison of color change values for oak 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 0.98 (0.54)h 1.58 (0.68)ıj − 7.76 (1.12)d 8.03 (1.06)cdef S1 − 6.00 (0.43)c 3.63 (0.51)n 4.95 (0.91)hı 8.62 (0.73)fgh
S2 − 6.59 (0.74)b − 6.90 (0.47)a 5.99 (2.38)ı 11.43 (1.54)k
S3 2.30 (0.34)kmn − 0.49 (0.70)ef − 7.78 (1.14)d 7.94 (0.85)cdef
5 0.14 (0.41)g 1.22 (0.56)hı − 2.76 (1.34)f 8.14 (0.76)defg S1 − 6.57 (0.46)b 2.02 (1.30)jm 5.94 (1.61)ı 9.22 (1.31)ghıj
S2 − 7.22 (0.41)a − 6.26 (1.11)ab 9.30 (1.52)j 13.42 (1.11)m
S3 2.55 (0.43)mn − 0.64 (0.88)ef − 3.86 (1.00)ef 4.78 (0.87)a
7 1.37 (0.27)hı 2.36 (0.60)m − 7.09 (1.11)d 8.19 (0.70)efg S1 − 5.07 (0.36)d 3.16 (0.51)n 0.86 (1.67)g 6.25 (0.48)b
S2 − 6.07 (0.61)c − 6.00 (0.60)b 5.28 (2.60)hı 10.25 (1.61)j
S3 2.63 (0.49)n − 0.60 (0.62)ef − 7.44 (0.94)d 7.94 (0.97)cdef
160 3 0.98 (0.48)h 0.00 (0.38)fg − 9.38 (1.37)c 9.45 (1.34)hıj S1 − 5.72 (0.33)c 3.01 (1.14)n 1.71 (1.40)g 6.89 (0.61)bc
S2 − 5.81 (0.69)c − 5.67 (0.66)b 3.76 (1.64)h 9.07 (1.05)fghı
S3 1.55 (0.47)ıj − 1.76 (0.60)d − 6.59 (0.96)d 7.03 (0.97)bcd
5 1.19 (0.41)hı 0.64 (0.72)gf − 9.75 (1.39)c 9.87 (1.41)ıj S1 − 4.58 (0.34)e 3.25 (0.67)n − 3.21 (1.71)ef 6.67 (0.67)b
S2 − 5.64 (0.62)c − 3.19 (0.94)c 0.82 (3.21)g 7.17 (1.31)bcde
S3 1.90 (0.40)jk − 1.67 (0.58)d − 7.52 (1.57)d 7.96 (1.57)cdef
7 2.08 (0.47)km − 1.08 (0.64)de − 18.55 (0.83)a 18.72 (0.80)n S1 − 4.01 (0.63)f 3.24 (0.77)n − 4.54 (2.01)e 7.13 (0.94)bcde
S2 − 5.89 (0.61)c − 3.65 (0.67)c 4.11 (2.84)h 8.38 (1.72)fgh
S3 1.09 (0.89)hı − 3.42 (0.75)c − 13.69 (1.05)b 14.19 (1.06)m
  1. Italic numbers indicate the highest and the lowest values of total color change (ΔE*)