造成木材變色的因素很多，主要分為兩個方面:內部因素和外部因素:
There are many factors that cause wood discoloration, mainly divided into two aspects: internal factors and external factors:
一、引起木材變色的內部因素:
1、 Internal factors causing wood discoloration:
木材主要由纖維素、半纖維素、木質素和少量的提取物組成。復雜的天然高分子化合物不僅含有羧基不飽和雙鍵和共軛體系，而且還含有羥基。
Wood is mainly composed of cellulose, hemicellulose, lignin and a small amount of extract. Complex natural polymer compounds contain not only unsaturated double bond and conjugation system of carboxyl group, but also hydroxyl group.
二世。導致木材變色的外部因素有:
II. The external factors that cause wood discoloration are:
木材很容易受到外界環境的影響，使木材表面紋理疏松、粗糙、變色和褪色，甚至木材失去表面附著纖維，被裂紋或脆性碎片逐漸脫落。
Wood is very easy to be affected by the external environment, which makes the surface texture of wood loose, rough, discolored and faded, and even the wood loses the fiber attached to the surface, and is gradually dropped by cracks or brittle fragments.
三、木材變色的原因、影響因素，如何預防和消除
3、 The causes and influencing factors of wood discoloration and how to prevent and eliminate them
光致變色:木材中的一些材料選擇吸收波長大于290nm的光，導致能級間電子的變化和光致變色化學鍵的形成，導致木材顏色的變化。
Photochromism: some materials in wood choose to absorb light with wavelength greater than 290nm, which leads to the change of electron between energy levels and the formation of photochromic chemical bond, which leads to the change of wood color.
光致變色保護:阻擋紫外線;改變材料中吸光成分的結構，破壞變色物質的結構，從而隔離氧并捕獲原子氧，捕獲自由基萃取溶劑。
Photochromic protection: block ultraviolet rays; change the structure of light absorbing components in materials, destroy the structure of color changing materials, so as to isolate oxygen and capture atomic oxygen, capture free radical extraction solvent.
光致變色刪除:
Photochromic delete:
為了消除淺色現象，恢復木材表面原有的正常顏色，可以采用以下兩種方法:
In order to eliminate light color and restore the original normal color of wood surface, the following two methods can be used:
1. 用砂紙或刨刀去除。適當的染料或顏料可用于變色材料。
1. Remove with sandpaper or planer. Suitable dyes or pigments can be used for color changing materials.
2. 用過氧化氫、亞氯酸鈉等氧化性漂白劑處理木材，分解破壞木材表面的發色結構體系。
2. wood was treated with oxidant bleach such as hydrogen peroxide and sodium chlorite.
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