Heat-induced colour changes of pine (Pinus pinaster) and eucalypt (Eucalyptus globulus) wood

By B. Esteves, António Velez Marques, Idalina Domingos, Helena Pereira. Wood Science and Technology, 2008

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Effect of Heat Treatment on Color Changes, Dimensional Stability, and Mechanical Properties of Wood (2012, background): “[13,22] The rate of reduction of L∗ decreased with treatment time, probably due to chemical stabilization of thermally modified wood at longer exposure.[13] In general, the contribution of red (a∗) and yellow (b∗) color decreased with heat treatment.”
Wood modification by heat treatment: a review. (2009, background): “A close relationship between hemicelulose content and bending strength was also reported by several authors (Winandy and Lebow 2001, Esteves et al 2008a).”
Chemical changes of heat treated pine and eucalypt wood monitored by FTIR (2013, background): “(2007) and Kocaefe et al. (2008b), and attributed to the breaking of aliphatic side-chains in lignin and/or condensation reactions. The band at 1460 cm-1 corresponds to the asymmetric deformation of C-H bond of xylan, while the band at 1420 cm-1 corresponds to the vibration of the aromatic ring of l”
Control of wood thermal treatment and its effects on decay resistance: a review (2016, unknown): “…that colour evolution could be also used as a classification method of treated wood, because it has a significant correlation with treatment intensity (Viitaniemi et al. 1997; Mitsui et al. 2001, 2003), the mass loss (Bekhta and Niemz 2003; Esteves et al. 2008) and also the thermal process used.”