1, look at the appearance of vermicelli: buy sweet potato vermicelli, the first thing is to look at the appearance of the vermicelli, real pure sweet potato vermicelli, generally made from sweet potato starch, according to the sweet potato varieties and starch quality of the different, vermicelli from the appearance, the color will be brown, or even yellow, green, the color will not be particularly bright, and will not be particularly transparent, if the vermicelli is too bright and transparent. If the color is too bright, transparent, it may be added gelatin and so on, eat more harmful to the body.

2, smell the smell of vermicelli: pure sweet potato vermicelli generally do not have any special odor, if you buy vermicelli, smell a bad taste, it should be extra attention, that vermicelli is likely to add some kind of chemical composition, for the smell of vermicelli, we had better not go to buy.

3, look at the toughness of the vermicelli: real pure sweet potato vermicelli, through the natural drying, it will become particularly brittle, generally gently with the hand can be broken, there will be broken vermicelli, if you buy the vermicelli root and root, with the hand is also very difficult to break, it may be added to the gelatin and other things, so buy vermicelli, be sure to use your hand folded, according to the toughness of the vermicelli to judge the vermicelli authenticity. The first thing you need to do is to get a good deal on a new product, and then you'll be able to buy it.

4, with the fire to burn a vermicelli: buy vermicelli, you can also use a lighter to burn a vermicelli, to identify the vermicelli authenticity, if it is a real sweet potato vermicelli, after ignition will naturally expand, burned, it will smell a burnt flavor, burned ashes, twisted in the hand, there is no sense of granularity.

If the sweet potato vermicelli is adulterated, black smoke comes out when it burns, and the smell after burning will be very unpleasant. The ash after burning will have a fine granularity when touched by hand and is not very smooth.

5, look at the cooking degree of vermicelli: pure sweet potato vermicelli will generally be more resistant to cooking, after the pot is about to cook 5 to 10 minutes or so, after cooking vermicelli is not easy to break, eat up the taste of smooth and elasticity; if the vermicelli under the pot a little bit of cooking on the rotten, that must not be pure sweet potato vermicelli, if it is a long time to cook, eat up the hardcore, most likely doped with cooking gum, that is not the real sweet potato vermicelli. The first thing you need to do is to get your hands on some real sweet potato vermicelli.

The real sweet potato vermicelli, generally encountered hot water will become soft, cooking about 5 to 10 minutes on the completely no hard core, this time you can eat.

The above content reference? Baidu Encyclopedia-Sweet Potato Vermicelli