Wood ripples (superstructure)
Refers to the horizontal ripple seen on the chord-wise longitudinal side of some wood due to the alignment of rays or axial molecules or both. There are ray superficial, axial thin-walled tissue superimposed, ducted and wood fiber. The wave marks seen under the naked eye are caused by the superstructure, such as persimmon, Dalbergia, red beans, etc.; but those with superstructures do not necessarily see wave marks, such as hedgehogs, under the naked eye.
1. Wood color is the main physical feature of wood under the naked eye magnifying glass, and is also an important supplement for microscopic identification of wood.
2. Wood color is caused by objective factors such as various pigments, resins, gums, tannins and oils in wood cells.
3. The color of the material varies greatly. Due to the dryness and dampness in the same tree species, the exposure time in the air is temporary, whether there is decay or the age of the tree, and the location of the section is different.
4. Subjective factors: The reflection of each person's color is easy to be inconsistent, so it is more difficult to correctly describe the color of the material.
5. Most of the wood is yellow or yellowish brown. Dark stripes sometimes appear on the longitudinal plane.
6. The sapwood is usually light in color, and the heartwood is usually dark.
7. The color description is based on the new cut surface of healthy gas dry material.
8. White or yellowish white, such as fir, poplar and so on. Yellow or yellowish brown, such as eucalyptus, berberine, lacquer tree, etc. Red or reddish brown, such as yew (heartwood), citron, thick skin and so on. Black or chestnut brown, such as black rosewood (heartwood), persimmon and so on. Yellow-green, such as green orchids. With dark stripes, such as citron.
9. Fungal discoloration: Wood is discolored due to fungal infections, such as the sapwood of Pinus massoniana.
10. Gloss is also a physical feature of wood, which refers to the brightness of light reflected onto the wood. It has nothing to do with the color and polishing properties. The gloss depends on the intensity of the reflection of the light and the angle at which the heartwood permeate and the light are reflected on the board.
11. Due to the ray relationship, the diameter of the surface is stronger than that of the chord; the gloss of the infiltrated body in the heartwood is also strong; the heart material with a lot of oily substances is weak; the decaying wood is dull, even if the initial rot will lose its luster. Gloss has nothing to do with color and finish.
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