Gluing: Good bird's nests have very thin walls, rough to the touch, and clear texture. Inferior bird's nests have thick walls, smooth to the touch, and no texture. Of course, the most important thing is to soak them. Good bird's nests. The foaming rate is about 8 times, while the foaming rate of inferior bird's nests is only 3-4 times. What you get is different. The soaking time of good bird's nests only takes about 4 hours, and the stewing time only takes 1 hour. Inferior bird's nests The soaking time needs 8-12 hours, the stewing time is longer, and it is resistant to stewing

Bleaching: Either the bird's nest is white or the bird's nest has been bleached. Carefully compare a batch of bird's nests to see if there are any spots between the bird's nests. Color difference, whether there is color difference in different places on a lamp. The key depends on whether the sulfur dioxide test results on the bird's nest test report exceed the standard (bleach water contains sulfur dioxide). The chemical reagent used to bleach the bird's nest will bleach the bird's nest and dissolve the fine hairs in it. Bird's nests that are purely hand-picked often have more impurities.