1. Appearance and texture: starch is dark in color, and raw flour is light or white in color. Starch has a rough texture and is easy to clump, while raw flour is delicate and not easy to clump.

2. Raw materials and production process: starch can be extracted from a variety of raw materials, raw flour is mainly extracted from rice or corn. The production process includes grinding, extraction, dehydration and other steps.

3. Usage and application: Starch is used to make ingredients to increase the consistency and texture, as well as to make slurry, paint and so on. Raw flour is used to make baked goods such as pastries and cookies, as well as seasonings for pickled foods.