1. Check the color

When we buy sweet potato flour, don’t just look for the bright and transparent ones. Because high-quality sweet potato flour is made of sweet potato starch, there will be more impurities in it, and it does not look so transparent and bright. This is also one of the characteristics of sweet potato flour. If the color doesn't look right, it's often because some gelatin and other additives are added to make the sweet potato flour look in line with modern aesthetics, but the taste is not good at all.

2. Smell the taste

As we said above, high-quality sweet potato flour is actually sweet potato starch, and it has no smell. There is no special fragrance. If the sweet potato flour you are about to buy has a strange aroma, it may be that some flavoring has been added to cover up the smell. If it still smells like some weird chemicals, then of course it’s even worse and you should definitely not buy it.

3. Look at the flexibility

The reason why sweet potato flour needs to be tied up with something is because of its flexibility, which is actually very bad and can easily break into pieces. This is also one of the points that should be paid attention to when packaging and transporting it. Some bad sweet potato flours, on the contrary, have better flexibility and will not break even if you bend them a lot. This kind of flour is likely to have something added inside, so of course you should not buy it.

4. Burn it with fire

With the help of a lighter, we can also judge the authenticity of sweet potato vermicelli. We take a piece of sweet potato vermicelli and burn it. If it continues to burn smoothly and then emits a chemical smell like burning plastic, it means that the quality of the sweet potato vermicelli is very poor. If it burns for a while and then stops, and there is a sign of burning starch in the middle, and the smell is the normal smell of burning starch, then it is real sweet potato flour. The so-called starch burning, you can try burning a noodle at home and remember the smell.

5. Look at the remaining ashes

After burning, there will always be some ashes left. If it were real sweet potato flour, he would pinch the remaining ashes with his hands and it would feel more delicate and not grainy. The fake sweet potato flour will have a fine sand-like feel.