Official Journal of the Japan Wood Research Society
Table 1 Colour coordinates of black alder and beech veneers before and after heat treatment
From: Effect of heat treatment on colour changes of black alder and beech veneers
Wood species | Heat treatment (temperature/time) | Colour coordinates | ΔE * | ||
|---|---|---|---|---|---|
(T °C/min) | L * | a * | b * | ||
Black alder | Control sample | 70.81 (1.65) | 8.42 (0.60) | 25.78 (0.28) | – |
190/5 | 68.72 (1.67) | 8.79 (0.56) | 25.37 (0.58) | 2.16 | |
190/10 | 66.38 (1.72) | 9.40 (0.50) | 25.04 (0.80) | 4.59 | |
190/20 | 60.69 (1.29) | 10.41 (0.27) | 25.38 (0.58) | 10.32 | |
190/40 | 57.05 (1.16) | 10.67 (0.23) | 23.97 (1.04) | 14.06 | |
Beech | Control sample | 70.47 (0.28) | 7.61 (0.18) | 21.51 (0.26) | – |
190/5 | 69.27 (0.27) | 7.86 (0.18) | 22.28 (0.42) | 1.45 | |
190/10 | 67.55 (0.81) | 8.51 (0.26) | 22.21 (0.45) | 3.13 | |
190/20 | 64.62 (0.38) | 9.48 (0.20) | 24.43 (0.58) | 6.80 | |
190/40 | 60.07 (1.58) | 10.45 (0.39) | 22.86 (0.58) | 10.86 | |