Bird's Nest refers to a nest made of saliva secreted by some Swifts of Swift Family of Swift Order and several Jin Siyan species of Swift genus, and then mixed with other substances. Bird's nest, also known as swallow, swallow root and swallow dish, can be divided into "house swallow" and "cave swallow" according to the nesting location. Dongyan has different colors due to the influence of minerals, including Bai Yan, Huangyan and Hongyan, while domestic swallow has only one ivory color. The so-called "blood swallow" on the market is said to be made of "bird droppings" by artificially bred domestic swallows.
The main origin of bird's nest is from the Philippines in the east to the desert island caves near the coast of Myanmar in the west, with Indonesia, Malaysia, Sandakan, Singapore, Thailand and the South China Sea islands as the majority. Among them, Indonesia's weather and environment are most suitable for swallows to live in compact communities, so its bird's nest has the best quality.
How to buy bird's nest:
1, look at the shape: the fibers on the bird's nest are clearly visible, the texture is clear and the thickness is different, the denser the better, and the capsule filaments inside the bird's nest are messy and loose. The top bird's nest should be complete and large (about three fingers in size). If swallows nest on the beams, the nest is boat-shaped; If you build a nest in the corner, the nest is triangular.
2. Color: Because each swallow's food and natural substances have different bird's nest colors, the bird's nest can be divided into several grades according to the quality, but the pure bird's nest with the highest quality is golden yellow, and the additive substances doped in the bird's nest can be seen by the naked eye.
3. Smell: High-quality bird's nest smells faint fishy and woody, while fake bird's nest is generally mixed with fish meal, cassava powder and tremella. It smells sour, fishy, chemically irritating or greasy.
The above contents refer to Baidu Encyclopedia-Bird's Nest