In the process of making rice noodles, vendors add alum and alum aluminum potassium sulfate dodecahydrate, which will release formaldehyde at high temperature. Formaldehyde is a highly toxic chemical, which is extremely harmful to human lungs, liver and kidney. It is a strong carcinogen, and it is forbidden to be used in food processing by the state.

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Because of the different molding technology, the basic shape of rice flour is also different. Rice flour is divided into squeezing powder and cutting powder according to the shape of the product.

Extrusion molding can get pressed powder, that is, straight rice noodles. Because of the different eating habits in different places, there are thick strips, medium strips and thin strips. Corrugated rice flour can also be obtained by adjusting the pressure in the extruder and the spinning speed. The steamed pulp is cut into strips, and the cut powder has a certain width and thickness. Because of the different eating habits in different places, there are medium-wide strips and thin strips.

Rice flour is divided into dry rice flour and wet rice flour according to the degree of dryness and wetness of its products. These include wet pressed rice noodles, wet cut rice noodles, dry pressed rice noodles and dry cut rice noodles. Rice flour can be divided into ordinary rice flour, refined dry rice flour, instant rice flour and fresh-keeping wet rice flour according to the different pretreatment methods of its products.

China Economic Net-The boss involved in adding sodium metabisulfite to the rice flour of a black-hearted vendor in Kunming was arrested.