5 Fire burning

Using fire to burn bird's nest to judge the bird's nest is also one of the methods of identification, its good quality of the genuine bird's nest, after burning by fire will be melted blisters, and there is no smell of smoke and odor, the ash is gray-white, and false inferior bird's nest due to the adulteration of other substances, the combustion of the sparks will be ringing, the emergence of black smoke, there is a scorched odor of the phenomenon of the ash for the black lumps.

6 Stewing method

In addition, the bird's nest will be boiled with diluted hydrochloric acid for 10 minutes, and the solution and samples of good bird's nest will be brown or brownish-black; there will be a strong smell of egg white after stewing and it will be crystal clear and transparent, whereas the fake bird's nest will be loosened and even dissolved when it encounters water, and the water will be cloudy and there will be oil floating in the water, and the "bird's wire" will not be transparent and will soon become transparent after stewing. The water color is cloudy and there is an oily substance floating in the water.

7 What is the situation of yellowish bird's nest 1, long time of sunshine

Dry bird's nest should be put in a cool and dry place at room temperature to save, so as to ensure that the quality of the bird's nest is not destroyed, if it is put in the place of strong light, long time of sunshine, the color of the bird's nest will be yellowish and discolored because of the long time of sunshine.

2. Oxidation

In addition, if dried bird's nests are placed in the air for a long time, oxidation will occur, resulting in internal color changes and yellowing.

3. Saliva Composition

Every swiftlet's nest is different, and the color of the bird's nest will change with the food that the bird eats, and the saliva composition secreted by the different food is more or less the same, resulting in the yellowish color of the bird's nest.

The color of the bird's nest will also change with the food the bird eats.