Oak wood is generally darker in color compared to beech wood. This difference in coloration is primarily due to the presence of tannins and other pigments in the wood. Oak trees, particularly red oak species, contain higher levels of tannins, which contribute to a richer, darker hue. Beech wood, on the other hand, has a lighter, more uniform color, often described as a creamy white or light brown. According to a study published in the Journal of Wood Science, the heartwood of red oak contains approximately 3.5-5.5% tannins, while the heartwood of beech contains only about 1.5-2.5% tannins. This higher concentration of tannins in oak results in a darker coloration. Additionally, the density and grain pattern of oak wood also contribute to its darker appearance, as the tightly packed grain can reflect more light and create a richer, more pronounced color.