The bird's nest upstairs is divided into positive and self-use grades. The positive film has perfect grade shape, uniform color and high density, so giving it away is the best choice. There are yellow spots and black spots, broken lamps for personal use, and the colors are uneven, but the price is affordable. It is a good choice for personal use. The bird's nest upstairs is marked with the words "for personal use". The colors are all yellow and gray, and some are dark.

Cooking method of bird's nest upstairs: take 2 cups at a time, pour in purified water and soak for 8 hours. After soaking, you can find that there is really no foreign hair, only one or two small black spots, which are complete and of good quality. Then tear it into shreds by hand, put it in a small pot stewed in water, pour in pure water and stew for half an hour until the bird's nest 1-2 cm ~. Crystal clear, air-cooled, just pack it into three 70g small jars, keep it in the refrigerator for one week, and heat it with milk and red dates or something before eating.