Many of the so-called fern root powder in the market are made of some fern root powder mixed with flour or potato powder. If you want to taste authentic fern root powder, you should try to pay attention to the following aspects when purchasing: (1) under normal circumstances, there is no specially treated fern root powder on the market, and it is generally not pure white. According to the general standards on the market, the ratio of white and black ingredients (substances naturally contained in fern roots) is about 60% and 40%. If the seller says it is specially refined, then the price must be much higher than the ordinary one. (2) Pure fern root powder does not reflect and refract light. After you buy something, you can use a hand electric light to illuminate the spread powder in a dark environment. If there is no reflective phenomenon on the surface of the powder, the basic situation is OK. If the surface is like a dazzling crystal of glass slag, congratulations, you may have bought fern root powder mixed with other powders (usually potato powder, sweet potato powder, or other powder). (3) after the fern root powder is stirred into a paste with water, the excess water is poured out and finally precipitated, the structure will be very tight, and the ordinary shaking will not cause its caking state to split and disperse. on the contrary, it is added with the mixture of other powders. (4) the real fern root starch melts quickly when it is put between the tongue, but the melting rate of fake starch or mixed with other powders is much slower. (5) put a small amount of fern root starch on the tip of the tongue, and then chew the starch slowly and carefully with your teeth. If you do not feel anything as hard as sand in the process of chewing, then the content of sand and other hard impurities in the whole batch of fern powder is relatively small.
