How to identify whether there is plastic in rice flour?

Can't identify, but can use other methods to identify the quality of fans.

Fold it by hand. Good vermicelli is uniform in thickness (wide vermicelli is uniform in thickness), without drawing and breaking, and it feels flexible, elastic and free of impurities.

There are irregular bubbles in pure potato vermicelli. The vermicelli made of pure sweet potato starch is very brittle after drying, and it will be broken with a little hand, and it is not easy to regain moisture after drying. The fake sweet potato vermicelli will not break after a week exposure in the sun, because there is an edible gum with unique toughness.

Extended data:

There are many kinds of rice noodles, which can be divided into row rice noodles, cube rice noodles, corrugated rice noodles, silver rice noodles, wet rice noodles and dry rice noodles. Their production processes are similar, generally: rice-elutriation-soaking-pulping-steaming powder-tabletting (shredding)-re-steaming-cooling-drying-packaging-finished products.

In the south of China, because rice is rich and popular, southerners are used to eating rice, and dry food is hard to swallow, so rice noodles are generally made into noodle soup.

How to eat rice noodles and the preparation of ingredients are different in different parts of South China. The rice noodles in Guizhou are quite spicy, and the soup is almost red. Guilin rice noodles and rice noodles produced in Hsinchu, Taiwan Province are both famous. Rice flour is a favorite food of Jiangxi people. There are almost no banquets and no rice noodles.

Baidu encyclopedia-rice noodle