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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
  1. Italic numbers indicate the highest and the lowest values of total color change (ΔE*)
  2. **The values in parentheses are the standard deviations; different letters in the parameter of colour change column indicate statistical differences at the 95% confidence level