Soak dried rice noodles for one night, boil the water, put the dried rice noodles in the pot and cook for about 2 to 3 minutes. Cooking time should not be too long, so as not to make the rice noodles too soft or too mushy. It should be noted that when using cold water to soak hair, dry river powder can be soaked for several hours until it becomes soft. When using warm water to soak hair, the water temperature can be controlled within a suitable range, and the general soaking time is about half an hour.