Look at the color first. Sweet potato vermicelli is opaque. The more transparent, the more problematic it is. Look at the shape again. The real sweet potato vermicelli has many protrusions in the middle and uneven thickness. That's because sweet potato starch is not easy to mix with water, and that's the problem.

The second is to see if there is resilience. If it is easy to break, it may be true. If it is not easy to break, it means it is fake. Even in humid environment, sweet potato vermicelli is easy to break.

Third, it can be burned. Try burning a fan with that lighter. Really sweet potato vermicelli will slowly expand, and it will be cooked after eating, so you can eat it. An inflated ball will appear when it is fake, and sometimes it will break when it is cooked.

First, the color of sweet potato vermicelli should be translucent dark blue or yellowish.

Second, real sweet potato vermicelli will have small pimples.

Third, the true sweet potato vermicelli will have different thicknesses.

Fourth, true sweet potato vermicelli is easy to break. Sweet potato flour itself has no toughness, even in wet weather, the vermicelli will break at a discount, and there is no alum.

Fifth, true sweet potato vermicelli is tasteless.

Sixth, true sweet potato vermicelli is easy to break, so there is only one layer.

Seventh, the true sweet potato vermicelli will expand after burning, and it will neither become a hard ball nor completely become powder.

Generally speaking, the real sweet potato vermicelli should be translucent dark blue or yellowish, and the transparent and bright vermicelli is basically added with additives. Secondly, sweet potato powder is not easily stirred by water, so there will be some small bumps with different thicknesses, and each one will not be the same size. Then there is the smell. Natural sweet potato powder has no peculiar smell. Generally speaking, ginseng has some spicy temperatures. Then sweet potato powder is easily broken. If it is not easy to break, it may be mixed with some glue, which will make it feel more elastic. You can also bake it with fire. The real sweet potato powder will swell a little, but it won't be too big, paste or turn into powder.