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。造成木材變色的外部因素是:
II. The external factors causing wood discoloration are:
木材易受外界環境的影響，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，由裂紋或脆性碎片逐漸脫落。
Wood is 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 gradually falls off from 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:木材中某些材料選擇吸收波長大于290nm的光，導致能級間電子的變化，形成光致變色的化學鍵，導致木材顏色的變化。
Photochromism: some materials in wood choose to absorb light with wavelength greater than 290nm, resulting in the change of electrons between energy levels, forming photochromic chemical bond, leading to the change of wood color.
光致變色防護:阻擋紫外線;改變材料中吸光成分的結構，破壞參與變色物質的結構，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 substances involved in color change, so as to isolate oxygen and capture atomic oxygen, capture free radical extraction solvent
光致變色刪除:
Photochromic delete:
為了消除光色現象，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 the phenomenon of light color and restore the original normal color of wood surface, the following two methods can be used:
1. 用砂紙或刨刀清除。對于褪色的材料可以涂上適當的染料或顏料。
1. Remove with sandpaper or planer. For fading materials, appropriate dyes or pigments can be applied.
2. 用過氧化氫、亞氯酸鈉等氧化漂白劑處理木材，分解破壞木材表面的發色結構體系。
2. Hydrogen peroxide, sodium chlorite and other bleaching agents were used to treat wood, and the color structure system of wood surface was destroyed.
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