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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
  1. Italic numbers indicate the highest and the lowest values of total color change (ΔE*)