1. Stew the bird's nest
2. Put rock bee candy in warm water, then put black wolfberry down, adjust to your favorite color, for example: dark or light
3. Just pour in the stewed bird's nest
Tips:Bird's nest is alkaline, black wolfberry turns blue when it meets it. The water is acidic and turns purple when soaked. There are also different places, the water quality is also different, the bubble is either blue or purple,
