2. Look. Comparing the whiteness and brightness of vermicelli, the authentic Longkou vermicelli has moderate whiteness and brightness, and the vermicelli is transparent or translucent. Taibai may have added bleach.
Step 3 pinch. On the premise that there is no problem in the first two steps, gently pinch the whole bag of vermicelli with your hands. Authentic Longkou vermicelli is flexible and elastic. If the vermicelli is brittle, it means the quality is not good.
Step 4 cook. This last step is the test of boiling resistance. Boil the vermicelli in boiling water for 40 minutes. If the fans don't stop, it proves to be an authentic Longkou fan.