Exercise:
1. Raw material: potato or sweet potato starch;
2. Make acaroid mites. Beat the starch into a thin paste with 50% hot water, then pour it into the prepared thin paste with boiling water, and stir it quickly for about 10 minute, and the paste becomes transparent and becomes powder. 0.5% alum is added to the rice flour paste, and mixed with a proper amount of wet starch, and the mixture is kneaded into a soft paste without particles and can be brushed without touching;
3. powder leakage. Put the dough on a colander with a sieve, put it on a boiling pot, and gently press the dough with your hands. If the next one breaks easily, it means that the dough is too thin. If the bottom strip is slow or uneven, it means that the dough is too dry and can be adjusted by adding powder or water. After boiling water, the vermicelli should be shaken frequently to avoid sticking to the bottom of the pot. It is best to keep the water temperature at 97 to 98 degrees Celsius. The distance between the colander and the water surface can be determined according to the fineness of the required powder. Generally around 55-65cm, the height is thin and the height is thick. When the vermicelli falls into the pot and floats, stir it up with a pole and then put it in a cold water tank to cool it. After cooling, wrap it into bundles and soak it in acid slurry for 3-4 minutes. Then pick it up and rinse it with clean water. Hang the cleaned vermicelli on the rope to dry evenly.