At first glance, it is pure bird's nest, which is cup-shaped, with loose fibers, filamentous texture, rich cracks, good air permeability and natural color.

Second smell: those with special smell and greasy smell are fakes.

Three pulls: Take a small piece of bird's nest and soak it in water. When it's soft, take the silk to pull it. If it is pulled, it is a fake. Rub it with your fingers. If it has no elasticity, it is a fake.

Patient, I suggest you eat Bai Yan. Compendium of Materia Medica records that bird's nest enters the lung to control qi, the kidney controls water, and the stomach supplements the spleen, which is not dry. The functions of bird's nest include nourishing yin, moistening dryness, invigorating qi, invigorating middle warmer, invigorating spleen and lung, treating deficiency, resolving phlegm and relieving asthma. It is most suitable to use bird's nest to replenish the body after a serious illness.