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1. Purity is related to the presence of dockage in the grain.
2. Dockage refers to material other than paddy and includes chaff, stones, weed seeds, soil, rice straw, stalks, inert material etc.
3. These impurities generally come from the field or from the drying floor. Unclean paddy increases the time taken to clean and process the grain.
4. Foreign matter in the grain reduces milling recoveries and the quality of rice and increases the wear and tear on milling machinery.