Official Journal of the Japan Wood Research Society
Table 2 Effect of different heating exposure time on heartwood color under 170 °C
From: Effects of heat treatment on water-soluble extractives and color changes of merbau heartwood
Heat treatment conditions | ΔL * | Δa * | Δb * | ΔE * | |
|---|---|---|---|---|---|
Heating temperature (°C) | Heating time elapsed (h) | ||||
Control | 0.0 | 0.0 | 0.00 | 0.0 | |
170 | 1 | −18.1 | 6.7 | −9.0 | 21.3 |
2 | −22.5 | 2.3 | −10.6 | 25.0 | |
3 | −23.4 | −15.2 | −9.4 | 29.5 | |
4 | −32.5 | −21.7 | −12.6 | 41.1 | |
5 | −31.1 | −24.1 | −14.1 | 41.8 | |