Soaking: dry oil must be soaked in water to swell and soften before eating. Take 2 grams of Oviductus Ranae, soak it in warm water or cold water 12 hours or more until it swells, remove red and black fascia, and wash it in cold water for 2-3 times.

After the frog oil is soaked, it is white, swollen, soft and elastic.

Never soak frog oil in boiling water. Use cold or warm water.

The amount of soaking water should be appropriate, neither too much nor too little;

Soaking time is related to room temperature. The soaking time can be shorter (6-8 hours) at high temperature and longer (8- 12 hours) at low temperature, and fresh water can be changed appropriately in the middle.

Frog oil should be soaked in it and used up the same day. Don't soak for many days at a time