Characteristics of acid branches:The difference of sapwood in the center of acid branch is obvious, sapwood is yellow-white to yellow-brown, some species are brown. Heartwood orange, light red brown, red brown, purple red, purple brown to black brown; Material color is uneven, dark stripe is apparent. The growth wheel is not obvious or slightly obvious. Loose or semi-ring hole, single pipe hole, a few diameter series of compound pipe hole or thin pipe hole group, containing dark gum, sediment or penetration fill. Axial thin - walled wing-assembly, poly - wing - like ribbon, ring bundle - like and wheel - like. Acid branch wood structure very fine to fine, the average hole chord diameter is not more than 200 microns; Diameter pattern is not obvious or slightly obvious, string mask ripple mark. Wood luster, sour or sour flavor (a few for rose aroma) texture oblique or staggered, fine and uniform structure (a few medium) corrosion resistance, strong durability. The material is hard and heavy, high strength, the dry density of wood is more than 0.85 g/cm 3 when the moisture content is 12%, usually submerged in water.

Acid branch is the main raw material of furniture of clear qing dynasty annatto: the furniture that makes with acid branch, although a few hundred years later, want to wipe a lacquer slightly moist only, as before if new and visible the fine that acid branch is qualitative, fix eyes on for common people early. Acerbity color has deep red and light red two kinds, have commonly \"grease\" quality is excellent, structure is close, sex firm qualitative heavy, can sink at water. Particularly obvious is the deep red is often sandwiched with dark brown or black stripes, texture is clear and rich variety. Sour branch furniture is polished, smooth and lubricated, and durable, giving people a kind of pure and implicit beauty. Not only the quantity is large, but also the wood quality is better and the manufacturing technology is more exquisite. In modern concept, it is true annatto furniture.