Discoloration occurs when the normal color of wood changes due to the action of the environment (sunlight, oxygen, moisture, temperature, etc.) and microorganisms (fungi).
1. Wood discoloration classification
Chemical discoloration: Felled wood causes abnormal discoloration such as reddish-brown, brown or orange-yellow due to chemical and biochemical reaction processes, which is chemical discoloration. Its color is generally relatively uniform, and the distribution is limited to the surface layer (up to 1-5 mm deep), and after drying, it fades and fades.
Discoloration of chameleon: formed by felling fallen wood sapwood under the action of chameleon. The most common are cyanosis and mildew. This is followed by other sapwood spots, with orange-yellow, pink or light purple, tan, etc. This defect is mainly caused by sluggish drying or lack of storage measures.
2. Wood decay
After the wood is eroded by wood decay fungus, not only the physical and mechanical properties are changed, but finally the wood becomes soft and brittle, in the form of sieve holes or powder, which is called decay.
According to the type and nature of decay, it is divided into white rot and brown rot.
