Large-leaved rosewood, scientific name Lu's black sandalwood, belongs to the mahogany national standard of the yellow sandalwood genus black acid branch wood. It has many similarities with sandalwood rosewood, but in contrast, its texture is thicker, the color is purple-brown, the brown lines are wider, and there are obvious veined brown eyes after polishing. Although it has gone through a period of turmoil, the large-leaf rosewood is indeed a more precious wood. In terms of current prestige, large-leaf rosewood ranks fourth among the 33 types of rosewood after the big red rosewood.
Chinese scientific name: Lu's black sandalwood
Latin scientific name: Dalbergia louvelii
Nickname: large-leaf rosewood, rosewood
Family: Leguminosae
Genus: Dalbergia
Distribution area: northern And northern Madagascar, northeast
Commonly known in French: Bois de rose
The new face of the heartwood is orange-red, and it turns dark purple or black purple for a long time; the scratches are obvious. Tube holes are rarely seen under the naked eye; the main one is a single tube hole; scattered; the chord diameter is up to 206 μm, the average is 149 μm; the number is at least 1 to 4 /mm².
Morphological characteristics
Axial thin-walled tissue is evident under a magnifying glass, mainly concentric layered thin lines (1-2 cells wide) and well-arranged. Wood fiber wall thickness. Visible under wood-ray magnifying glass; inconspicuous wave marks; homomorphic single column of ray tissue. Weak acid aroma, very fine to fine structure, staggered texture, local curl, dry density of 0.95g/cm³.
According to the Forestry Research Institute of Madagascar, the data on the physical and mechanical properties of its wood are as follows: the source of the test material, Madagascar; the dry density of the test material is 0.95g/cm3; the dry shrinkage rate of the total dry material: radial 3.7%, the chord direction is 6.7%, the volume is 10.5%; the bending strength is 215.7Mpa; the ciss grain compressive strength is 77.5 Mpa; and the hardness is 12.5N.
Correlation comparison
When experts identify tree species, they also noticed that after dissecting the tree species, they were observed under the microscope, and the microscopic structure of the chordal section of Lu's black sandalwood (said large-leaf rosewood) and sandalwood rosewood (said small-leaf rosewood) belonged to a single row of rays, so it can be concluded that the two tree species have a certain blood relationship, so the appearance of the furniture made is somewhat similar. But after all, there is a big difference between the two, from the perspective of physical characteristics, air dry density, bending strength, elastic kernel, linear compressive strength, etc., Lu's black sandalwood is not as good as sandalwood rosewood. The tube holes of the former are also rougher than those of the latter. Therefore, furniture made of Lu's black sandalwood is not as stable as sandalwood rosewood furniture.
Compared with the appearance of the original tree, the two are also quite different, and the lu's black sandalwood tree path is slightly thicker, unlike the rosewood, which has so many holes. When the saw is opened, Lu's black sandalwood has a sour aroma (so called sour branches), while rosewood has a slightly spicy taste, and long is sandalwood.
The origin of the name rosewood large-leaf
In 1996, someone imported a kind of wood from Madagascar, its new cut surface is orange-red, long turned dark purple, its texture characteristics are similar to the rosewood used in Classical Furniture in China, which was identified as rosewood by the Forbidden City Research Institute. Since then, after arduous efforts, a certain trade department has finally discovered rosewood species from the dense forests of islands in the Indian Ocean, and acquired hundreds of tons of rosewood raw materials, which is the first time since the Ming and Qing dynasties that a large number of rosewood raw materials have been imported. After the identification of ming and qing dynasty classical furniture experts at the Palace Museum in Beijing, it was confirmed that it was old rosewood that was used during the Ming Dynasty in China, thus denying the claim that the real rosewood has long been extinct for a hundred years" The news was widely spread. Many people start stockpiling this "rosewood" and buying furniture or crafts made from these "rosewoods".
This news was called in magazines, TELEVISION advertisements, and the Internet at that time that this so-called "rosewood" was widely used by the Ming and Qing emperors, and many rosewood furniture in the Forbidden City was used in this so-called "island rosewood" (in fact, there is no such plant in "plant taxonomy", it is purely fabricated). The results alarmed the United Nations Environmental Protection Organization. The United Nations Environmental Protection Organization (UNEEP) informed the Malagasy government to stop logging rosewood and the rosewood trade.
Madagascar then submitted a written report to the United States for Environmental Protection that it did not produce rosewood and that the dark hardwoods it exported to China and other countries were not rosewood. The United Nations Environmental Protection Organization also specially invited experts from the French Institute of Tropical Timber to visit Madagascar and drafted a detailed report to the United Nations to confirm the fact that the report of Madagascar was true. In order to correct the misleading, Madagascar officially provided all the information of "Lu's Black Sandalwood" to the Chinese Forestry Research Department, and the truth has since been revealed.
But at this point, for this kind of wood, in the country is already hoarding, buying and buying. The truth of the matter poses a great threat to the credibility and interests of some people. The ideas or interests of several people have become an international joke, and in the face of the truth, how to resolve this embarrassing situation.
In 2000, the National Standard for Mahogany of the People's Republic of China (Mahogany GB/T 18107-2000) was hastily introduced, and the National Mahogany Standard stipulated that 33 wood varieties of 5 genera and 8 categories were mahogany. Among them is this kind of "rosewood" that is not rosewood. It is classified as a black acid branch in the genus Yellow Sandalwood, and the scientific name is "Lu's Black Sandalwood". In this way, this "Lu's black sandalwood" has become mahogany and has become a precious wood. But after all, this makes it change from rosewood to sour branch wood, the drop is still relatively large, so the real rosewood (sandalwood rosewood) has an extra name "small leaf rosewood". Why is it called "small leaf rosewood", because there is also a "big leaf rosewood" name to exist, that is, this black acid branch of the Lu's black sandalwood.
In 2001, some people made this process of reversing black and white public, and an expert also publicly apologized and asked for permission to correct academic deviations, in fact, many people already knew the truth of "Lu's black sandalwood" at that time. Now it seems that not many people know the truth of this matter, and when it comes to the origin of the names "small-leaf rosewood" and "big-leaf rosewood", most people are still only blinded by the so-called "small-eyed rosewood and big-eyed rosewood's child's voice evolution theory".
Identification method
From a macroscopic point of view, Lu's black sandalwood is similar to sandalwood rosewood in several points:
1. Both are orange-red in the new cut of the heartwood, and turn to dark purple or black purple for a long time;
2. Lu's black sandalwood has cow hair and venus, but the line pattern is thicker and sparser than sandalwood rosewood.
If viewed microscopically, the difference between the two is also obvious.
The cross-sectional face ratio shows that the axial thin-walled tissue of Lu's black sandalwood is mainly a thin line of concentric layer type (1 to 2 cells wide), and the arrangement is regular. Sandalwood rosewood is an axial thin-walled tissue, mainly concentric layered or slightly wavy thin lines (1 to 2 cells wide), thin ring tube bundle.
Radial cut ratio description: Lu's black sandalwood fiber wall thickness, wood ray height 6-9. Sandalwood rosewood fibers are thick, filled with red gum and pterostilbene, and wood ray heights of 4-7.
The string tangential ratio shows that the fibers and wood rays of Lu's black sandalwood are thicker than those of sandalwood rosewood. At a height of 1 mm, Lu's black and yellow sandalwood rays have a complete 2-segment arrangement, and sandalwood rosewood has a 4-segment complete arrangement.
Coastal Sandalwood
It is worth noting that there is also a wood, Dalbergiamaritime Viguier, which also originates in Madagascar. It belongs to the same kind of commercial material as Lu's black sandalwood, and its appearance is similar, but the wood performance is a little worse than That of Lu's black sandalwood, and the two are easily confused.