We must first grasp some of the characteristics of wood, such as how internal oak doors will impact the color of the wood over time before we can begin our little examination.
Natural pigments are what give wood its color and quinones and polyphenolic compounds, a class of chemicals, are what give this its definition. The polyphenolic molecules are transparent, making quinones the actual pigments. But as we’ll talk about later, they might grow in significance over time.
Extractives, as they are commonly known, are present in all wood. The colors, tannins, and other resins are considered extractives, which have been covered in a few prior articles. The term “extraction” refers to the process of ‘extracting’ something using a solvent, such as water or the mineral turpentine.
The presence of lignin in lumber is another essential component that may influence how it changes color over time. Timber fibers are held together by lignin, which acts as glue. The most significant part of the wood’s structure is this one.
The discoloration is most commonly caused by weathering, which is also its primary cause. Behind this, there are primarily two mechanisms:
1. The extractives, including the natural colors or quinones, bleed away when exposed to rain. The wood will become lighter after this treatment.
2. The lignin degrades into simple sugars when exposed to UV light. Molds, which can have a black and blotchy look, use these sugars as a food source. However, in conditions where they are managed, such as in dry or coastal regions, they don’t fully develop and turn the wood a silver-grey color.
In terms of oak wood, over the course of many years, it begins to turn a yellow to golden color; this is primarily caused by UV exposure.