Authentic sweet potato flour turns black when burned.

Authentic sweet potato flour will be fine gray or black ashes after burning, while unauthentic sweet potato flour with glue will have lumps that cannot be crushed after burning.

How to choose sweet potato flour?

First look at the price: Good sweet potato vermicelli is generally more expensive, and their market price is around 15 yuan. If the vermicelli you buy is cheap and cheap, it is basically fake sweet potato vermicelli.

The second thing to look at is the color: When we buy sweet potato vermicelli, we should look at its color. The color of real sweet potato vermicelli is generally translucent dark cyan or slightly yellow, and the more transparent the better. Moreover, it is uniform in thickness, and there are small white lumps in individual vermicelli. If you encounter ones that are particularly bright in color, completely transparent and white in color, they are usually fake sweet potato vermicelli.

Third, look at the toughness: Sweet potato vermicelli is made of sweet potato flour. Because the raw material only contains sweet potato starch, it becomes brittle after drying and is not easy to get wet. It is easy to break by hand and will fall off a lot. of debris. The vermicelli mixed with edible colloid is very tough and will not break when folded.