Cheng fen:

In fact, flour is extracted by removing gluten. The so-called flour, also known as wheat flour, is a powder made by processing flour to remove gluten, then precipitating gouache with gluten, filtering and drying, and then drying and grinding. Features: white color, smooth surface, translucent, crisp and cool, smooth entrance of steamed products and crisp fried products. They are usually sold in supermarkets, food stores and flour shops. Currently only in Guangdong. This kind of powder is soft, with small ductility and high plasticity. Pastry chefs make use of their characteristics to produce various exquisite snacks, such as Dragon Ball jiaozi, Waterfront jiaozi, Baihua jiaozi, etc., with diverse and novel styles.

Raw flour:

In Chinese food, it refers to starch, which is used for thickening and sizing when cooking. There are many kinds, such as sweet potato starch, water bean powder used in Sichuan cuisine and corn starch.

Raw flour is starch, which can have many kinds, generally referring to corn starch.