After the bird's nest is soaked in clean water, if it loses elasticity or produces oily floating matter on the water surface, it is a fake bird's nest. The real bird's nest is soft, elastic, crystal clear, and can expand and contract when opened by hand.

Bird's nests originally have a certain weight when the swiftlets are made. They are dried in the air and become dry. Therefore, after soaking in water, the bird's nests are soaked back to their original weight. Dried bird's nests The water content is about 5%. After absorbing water, it expands and becomes larger and heavier. Generally, each gram of dried bird's nest can expand about 10 times after soaking.

How to soak bird’s nest?

Take a cup of bird's nest and soak it in pure water. Normal temperature water is enough. It is not suitable to use hot water. High temperature will easily destroy the nutrition of the bird's nest. It usually takes 2-3 hours to soak the bird's nest when it is wet and dry. The soaking time for picking bird's nests is generally 4-6 hours. You can also pinch it with your hands. If the bird's nest becomes soft enough to be torn apart, it is done.