Huang Huali is a special material in Ming and Qing Dynasties, also known as "blood pressure lowering wood". Known as Dalbergia odorifera in Compendium of Materia Medica, it is mainly produced in Hainan, Vietnam, Laos and other places. Its wood can lower blood pressure and blood fat, and can relax muscles and promote blood circulation when used as a pillow. Huang Huali, born in Hainan Island, is extremely easy to survive, but extremely difficult to grow. Over-cutting leads to its scarcity, pleasant fragrance and vivid texture, which makes Huang Huali wood gradually become the first choice for furniture, and is widely respected by scholars in past dynasties. Since the Tang Dynasty, China has made vessels from rosewood. At present, there is a shortage of materials produced in Hainan, so a lot of them are imported from Vietnam, Myanmar, Laos and other places. The color of wood in Huang Huali ranges from orange to purple, and the heartwood is yellowish brown. Hard texture, beautiful pattern, and fragrant when sawing. Because the texture of Huanghua pear is hidden or present, vivid and changeable, the color is not light and the material is large, it has always been considered as the best in wood. What we usually see is mostly Huang Huali, Vietnam, which is produced in Vietnam. Because Vietnam and Hainan are geographically close, basically at the same latitude, Huang Huali, Vietnam is very close to Huang Huali, Hainan, especially the timber produced in the east of Vietnam and across the sea from Hainan. Therefore, some businessmen use Vietnamese Huang Huali as Huang Huali. Because wood appraisal institutions can only do tree species appraisal, but can't provide the identification certificate of the exact origin of wood, then no one can make a legal explanation for the merchant's statement, and consumers can only judge by experience when purchasing products. This is very difficult. Relevant people put forward the following five points: First, Hainan yellow is exquisite and uniform in texture, and the English "V" shape is usually a large plate texture with flowing wood grain. Among them, the characters are ever-changing, multifaceted and vivid. Every "face" is full of ink and faint colors, which is incredible after reading, and there are other interesting graphics, such as Buddha's shadow, tiger skin pattern, eyes and so on. In Huang Huali, Vietnam, the texture is coarser and more chaotic, and there are fewer graphic textures, especially fewer faces, but there are also Buddha shadows and spray shadows. Second, Huang Huali wood has a special smell. Huang Huali has a strong fragrance called Dalbergia odorifera. After smelling it, it is pleasant and fragrant. Huang Huali wood is soaked in Buddha water, and its fragrance is fragrant. Huang Huali in Viet Nam has a slightly light and pungent smell after smelling it. Thirdly, from the material point of view, the diameter of Huang Huali is generally small, and the diameter of heartwood is only about 20 cm. The wood in Huang Huali is slightly thicker, and we can often see raw materials with a diameter of 30-50 cm (heartwood) in the market. Fourth, there are also differences in color between the two. Huang Huali has good wood quality, light sapwood color, reddish brown heartwood, hard texture, delicate and beautiful texture, delicious color, clear texture and rich fragrance. Most of the elegant furniture in Ming Dynasty was made of old rosewood. The wood color of new rosewood is suitable for carving and making furniture. The texture color of Huang Huali is slightly worse, the color is lighter, from red to yellow, and the material is slightly loose. 5. It's hard to tell whether you met Huang Huali Wood who is very close. According to the master of a famous local mahogany factory in Hainan Island, it can be enlarged with a high magnification magnifying glass. Huang Huali is a single cell, and Huang Huali is a double cell. The difference between the above two kinds of wood is relative, and both of them can be identified only after the wood is partially planed. Although this kind of appraisal is difficult, it is not a problem for experienced people.