1. Bird's nest may break during plucking, cleaning or transportation, and it cannot become a strip after breaking. We call it broken swallow. Broken Yan has no fixed shape, and some farmers press broken Yan into different shapes of Yan balls or cakes during processing.

2. The broken swallow must have fallen from the swallow (Mao Swallow, Bai Yan Swallow). Picking, transportation, processing and accidental injury will all produce broken Yan, and the quality of broken Yan is determined by different technologies and different shedding sources. But the really good broken swallow is broken from the white swallow lamp, which was accidentally damaged by picking, processing and transportation. Among them, picking wool produces the most, and this part is really ugly.

Second, the difference between bird's nest and broken swallow.

1, shape

Swallow silk is silk, swallow cup is a strip, and the taste is not as good as swallow cup.

Step 2 write a composition

The bird's nest cup is the main component of bird's nest, and the broken bird's nest is often the leftovers of some swallows or the swallows with heavy hair pick it out. As we all know, heavy-haired swallows don't pick, and the time cost is too high. Generally, it is bleached with liquid medicine, so the safety cannot be guaranteed.

3. Price

Broken swallow is the cheapest and the worst quality.

Third, the identification method of bird's nest

1, look: the middle of bird's nest is filiform structure, and the corner of bird's nest is flaky structure; Pure bird's nest is not completely transparent, but translucent, whether it is soaked or watched under the light.

2. Smell: Bird's nest has a unique smell, similar to lime smell, but without strong smell.

3. Touch: Take a small piece of bird's nest and soak it in water. When it's soft, bring the silk and pull it. Poor elasticity. If it is pulled, it is a chemical processed product; If you rub it with your fingers, it is also a chemically processed product that can be rubbed into a paste without elasticity.