1： Check: Check if the vermicelli produced from legitimate manufacturers and if they there is QS logo on package. Also, pay attention for the production date and shelf life on package.
2：Observe: Comparing the whiteness and brightness of vermicelli, the authentic vermicelli have moderate whiteness and brightness, and looks transparent or semi-transparent. Excessive whiteness may caused by bleach.
3： Touching: If the first two steps going smoothly, then gently pinch the entire bag of vermicelli with your hand. The Authentic Longkou vermicelli is flexible and elastic; If it feels crispy and have broken strips, it indicates poor quality.
4：Boiling: The last step is to test cooking resistance ,after cooking in boiling water for 40 minutes, If the vermicelli keep intact and not break, it proves it was authentic Longkou vermicelli.
