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<p>Discoloration, where the normal color of wood changes, it is called discoloration. There are two types of <a href="https://www.solidwoodendoor.com/" rel="noopener noreferrer" target="_blank">wooden door</a> discoloration: chemical discoloration and fungal discoloration.</p><p><br></p><p>A: Chemical discoloration: The abnormal discoloration of reddish-brown, brown or orange-yellow lines caused by the chemical and biochemical reaction process of felled wood is chemical discoloration. The color is generally more uniform, and the distribution is limited to the surface layer (deep to 1-5 mm). After drying, it fades and becomes lighter. However, there is also a phenomenon that the sapwood part of the softwood and sapwood transported by water produces macula after rapid drying.</p><p>Effect on material: Chemical discoloration has no effect on the physical and mechanical properties of wood. In severe cases, only the appearance of the decorative material will be damaged.</p><p><br></p><p>Color 1: The discoloration of wood caused by the invasion of fungi is true fungus discoloration.</p><p>2 Discoloration: The surface of the sapwood is formed by the infection of mold mycelium and sporophyte. Its color varies with the color of spores and hyphae and the pigment secreted; there are different colors such as blue, green, black, purple, and red. Usually in the form of scattered spots or dense thin layers.</p><p>Impact on the material: Mold is limited to the surface of the wood and is easy to remove after drying, but sometimes stains remain on the surface of the wood, which damages the appearance of the wood, but does not change the strength of the wood.</p><p><br></p><p>B: Discoloration by chromobacteria: It is formed by the sapwood of felled wood under the action of chromobacteria. *The common one is green change or green skin. Followed by other sapwood stains, orange-yellow, pink or light purple, brown and so on. This defect is mainly caused by slow drying or lack of storage measures.</p><p>Effect on the material: The discoloration of the chromophore generally does not affect the physical and mechanical properties of wood. However, when it is severely green, the impact strength of the wood is slightly reduced. And enhance its water absorption, damage the appearance of wood. Usually this discoloration does not cause decay.</p><p><br></p><p>Discoloration of decay fungi: It is formed at the early stage of the invasion of wood by decay fungi. The most common is erythema. Some are light reddish brown, brown or purplish red; some are also pale yellowish white or pinkish brown. All fungi that destroy wood will cause wood discoloration when it starts to move. Heartwood erythema or other stains are mostly caused by wood rot fungi in the early stage of the tree's growth period. Sapwood erythema or other stains are caused by wood-rot fungi invaded early due to poor storage of felled or sawn timber.</p><p>Impact on the material: The wood in the early stage of decay still maintains its original structure and hardness, and its physical and mechanical properties are basically unchanged. But some have a slight decrease in impact strength, a slight increase in water absorption, and damage to appearance. Without drying or improper storage and use, it will develop into decay.</p><p><br></p>
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