The first thing to buy sweet potato vermicelli is to look at the appearance. The real pure sweet potato vermicelli is generally made of sweet potato starch. According to the variety of sweet potato and the quality of starch, vermicelli will be brown in appearance, even yellow and blue, and the color will not be particularly bright or transparent.

Step 2 smell the fans

Pure sweet potato vermicelli generally has no special smell. If the purchased vermicelli has an odor, you should pay special attention to it, indicating that some chemical components are probably added.

3. Look at the toughness of vermicelli

Real pure sweet potato vermicelli will become particularly brittle after natural drying, and there will be broken vermicelli when you gently break it with your hand. If the purchased vermicelli has clear roots, it is difficult to break them by hand, and there may be something like gelatin added in it, so when buying vermicelli, you must fold it in half by hand, and judge the authenticity of vermicelli according to its toughness.

4. Burn the vermicelli with fire

When buying vermicelli, you can also burn vermicelli with a lighter to identify the authenticity of vermicelli. If it is a real sweet potato vermicelli, it will naturally expand after burning. After burning, you will smell a burning smell. Twist it by hand after burning ash, without any graininess. If it is adulterated sweet potato vermicelli, it will emit black smoke when burning, and the smell after burning will be very unpleasant. The burnt ashes will feel fine and not very smooth when touched by hand.

5. Look at the cooking resistance of vermicelli.

Pure sweet potato vermicelli is generally resistant to cooking, and it takes about 5 to 10 minutes to finish cooking. The cooked vermicelli is not easy to break and tastes smooth and elastic. If the vermicelli is rotten after a little cooking, it must not be a pure sweet potato vermicelli. If it is cooked for a long time and the core is hard, it is mostly mixed with edible gum, not real sweet potato vermicelli.