The color parameters of untreated wood powder and wood powder after warm-press forming were measured according to standard colorimetric systems. The composition of the sample was tested by wet chemistry technique. The chemical compositions of the sample after warm-press forming were analyzed by using X-ray photoelectron spectroscopy (XPS) and UV–Vis. The results showed that as the forming temperature increased, the lignin, the extracts and the absorption in the visible range increased, while the cellulose and the O/C values decreased. Besides, the color of the sample became darker. The changes in the chemical composition on the surface of the wood powder compact induced the color change.

根据标准比色系统测量未经处理的木粉和热压成型后的木粉的颜色参数。通过湿化学技术测试样品的组成。使用X射线光电子能谱（XPS）和UV-Vis分析了热压成型后样品的化学成分。结果表明，随着成型温度的升高，木质素，提取物和可见光吸收率增加，而纤维素和O / C值降低。此外，样品的颜色变深。木粉压块表面化学成分的变化引起颜色变化。