Colour changes and acid formation in wood during heating

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Control of wood thermal treatment and its effects on decay resistance: a review (2016, unknown): “This darker shade which is conferred to the wood by heat treatments is given by the production of colored degradation products from hemicelluloses (Sehistedt-Persson 2003; Sundqvist 2004) and from the ex-tractives components (McDonald et al. 1997; Sundqvist and Morén 2002).”
Quality control of thermally modified timber: Interrelationship between heat treatment intensities and CIE L*a*b* color data on homogenized wood samples (2007, background): “Recent studies (Patzelt et al. 2003; Sundqvist 2004; Johansson and Morén 2006) showed that the change in color is a useful indicator of the intensity of a heat treatment.”
Wood modification by heat treatment: a review. (2009, background): “The darker tonality of heat-treated wood is often attributed to the formation of coloured degradation products from hemicelluloses (Sehlstedt-Persson 2003; Sundqvist 2004) and to extractives that seem to participate in the colour formation of heat-treated wood.”
A review of wood thermal pretreatments to improve wood composite properties (2013, unknown): “Change in color has been attributed to the oxidation of phenolic compounds (Sundqvist 2002, 2004), the presence of reduced sugars and amino acids, the emanation of formaldehydes (Sandoval-Torres et al. 2010), the formation of quinines, or the caramelization of holocellulose components (Boonstra…”